diff --git a/x-pack/plugins/apm/public/components/shared/charts/CustomPlot/index.js b/x-pack/plugins/apm/public/components/shared/charts/CustomPlot/index.js
index 7e74961e57ea1..b072c22c09c19 100644
--- a/x-pack/plugins/apm/public/components/shared/charts/CustomPlot/index.js
+++ b/x-pack/plugins/apm/public/components/shared/charts/CustomPlot/index.js
@@ -79,6 +79,14 @@ export class InnerCustomPlot extends PureComponent {
         return i === _i ? !disabledValue : !!disabledValue;
       });
 
+      if (typeof this.props.onToggleLegend === 'function') {
+        //Filters out disabled series
+        const availableSeries = this.props.series.filter(
+          (serie, index) => !nextSeriesEnabledState[index]
+        );
+        this.props.onToggleLegend(availableSeries);
+      }
+
       return {
         seriesEnabledState: nextSeriesEnabledState,
       };
@@ -235,6 +243,7 @@ InnerCustomPlot.propTypes = {
     })
   ),
   noHits: PropTypes.bool,
+  onToggleLegend: PropTypes.func,
 };
 
 InnerCustomPlot.defaultProps = {
diff --git a/x-pack/plugins/apm/public/components/shared/charts/TransactionCharts/TransactionLineChart/index.tsx b/x-pack/plugins/apm/public/components/shared/charts/TransactionCharts/TransactionLineChart/index.tsx
index eaad883d2f9f6..3657a02b1589c 100644
--- a/x-pack/plugins/apm/public/components/shared/charts/TransactionCharts/TransactionLineChart/index.tsx
+++ b/x-pack/plugins/apm/public/components/shared/charts/TransactionCharts/TransactionLineChart/index.tsx
@@ -5,22 +5,13 @@
  */
 
 import React, { useCallback } from 'react';
-import {
-  Coordinate,
-  RectCoordinate,
-} from '../../../../../../typings/timeseries';
+import { Coordinate, TimeSeries } from '../../../../../../typings/timeseries';
 import { useChartsSync } from '../../../../../hooks/useChartsSync';
 // @ts-ignore
 import CustomPlot from '../../CustomPlot';
 
 interface Props {
-  series: Array<{
-    color: string;
-    title: React.ReactNode;
-    titleShort?: React.ReactNode;
-    data: Array<Coordinate | RectCoordinate>;
-    type: string;
-  }>;
+  series: TimeSeries[];
   truncateLegends?: boolean;
   tickFormatY: (y: number) => React.ReactNode;
   formatTooltipValue: (c: Coordinate) => React.ReactNode;
@@ -28,6 +19,7 @@ interface Props {
   height?: number;
   stacked?: boolean;
   onHover?: () => void;
+  onToggleLegend?: (visibleSeries: TimeSeries[]) => void;
 }
 
 function TransactionLineChart(props: Props) {
@@ -40,6 +32,7 @@ function TransactionLineChart(props: Props) {
     truncateLegends,
     stacked = false,
     onHover,
+    onToggleLegend,
   } = props;
 
   const syncedChartsProps = useChartsSync();
@@ -66,6 +59,7 @@ function TransactionLineChart(props: Props) {
       height={height}
       truncateLegends={truncateLegends}
       {...(stacked ? { stackBy: 'y' } : {})}
+      onToggleLegend={onToggleLegend}
     />
   );
 }
diff --git a/x-pack/plugins/apm/public/components/shared/charts/TransactionCharts/index.tsx b/x-pack/plugins/apm/public/components/shared/charts/TransactionCharts/index.tsx
index 583a16281edc4..e55f86bd3abf3 100644
--- a/x-pack/plugins/apm/public/components/shared/charts/TransactionCharts/index.tsx
+++ b/x-pack/plugins/apm/public/components/shared/charts/TransactionCharts/index.tsx
@@ -29,7 +29,11 @@ import { Coordinate, TimeSeries } from '../../../../../typings/timeseries';
 import { LicenseContext } from '../../../../context/LicenseContext';
 import { IUrlParams } from '../../../../context/UrlParamsContext/types';
 import { ITransactionChartData } from '../../../../selectors/chartSelectors';
-import { asDecimal, asDuration, tpmUnit } from '../../../../utils/formatters';
+import {
+  asDecimal,
+  getDurationFormatter,
+  tpmUnit,
+} from '../../../../utils/formatters';
 import { isValidCoordinateValue } from '../../../../utils/isValidCoordinateValue';
 import { MLJobLink } from '../../Links/MachineLearningLinks/MLJobLink';
 import { BrowserLineChart } from './BrowserLineChart';
@@ -54,11 +58,6 @@ const ShiftedEuiText = styled(EuiText)`
   top: 5px;
 `;
 
-const getResponseTimeTickFormatter = (t: number) => asDuration(t);
-
-const getResponseTimeTooltipFormatter = (p: Coordinate) =>
-  isValidCoordinateValue(p.y) ? asDuration(p.y) : NOT_AVAILABLE_LABEL;
-
 export function getMaxY(responseTimeSeries: TimeSeries[]) {
   const coordinates = flatten(
     responseTimeSeries.map((serie: TimeSeries) => serie.data as Coordinate[])
@@ -140,9 +139,28 @@ export function TransactionCharts({
       </EuiFlexItem>
     );
   }
-
   const { responseTimeSeries, tpmSeries } = charts;
   const { transactionType } = urlParams;
+  const maxY = getMaxY(responseTimeSeries);
+  let formatter = getDurationFormatter(maxY);
+
+  function onToggleLegend(visibleSeries: TimeSeries[]) {
+    if (!isEmpty(visibleSeries)) {
+      // recalculate the formatter based on the max Y from the visible series
+      const maxVisibleY = getMaxY(visibleSeries);
+      formatter = getDurationFormatter(maxVisibleY);
+    }
+  }
+
+  function getResponseTimeTickFormatter(t: number) {
+    return formatter(t).formatted;
+  }
+
+  function getResponseTimeTooltipFormatter(coordinate: Coordinate) {
+    return isValidCoordinateValue(coordinate.y)
+      ? formatter(coordinate.y).formatted
+      : NOT_AVAILABLE_LABEL;
+  }
 
   return (
     <>
@@ -166,6 +184,7 @@ export function TransactionCharts({
                 series={responseTimeSeries}
                 tickFormatY={getResponseTimeTickFormatter}
                 formatTooltipValue={getResponseTimeTooltipFormatter}
+                onToggleLegend={onToggleLegend}
               />
             </React.Fragment>
           </EuiPanel>
diff --git a/x-pack/plugins/apm/public/utils/formatters/__test__/duration.test.ts b/x-pack/plugins/apm/public/utils/formatters/__test__/duration.test.ts
index c4d59beb4b7a2..ca8a4919dd216 100644
--- a/x-pack/plugins/apm/public/utils/formatters/__test__/duration.test.ts
+++ b/x-pack/plugins/apm/public/utils/formatters/__test__/duration.test.ts
@@ -20,9 +20,12 @@ describe('duration formatters', () => {
         '10,000 ms'
       );
       expect(asDuration(toMicroseconds(20, 'seconds'))).toEqual('20 s');
-      expect(asDuration(toMicroseconds(10, 'minutes'))).toEqual('10 min');
+      expect(asDuration(toMicroseconds(10, 'minutes'))).toEqual('600 s');
+      expect(asDuration(toMicroseconds(11, 'minutes'))).toEqual('11 min');
       expect(asDuration(toMicroseconds(1, 'hours'))).toEqual('60 min');
-      expect(asDuration(toMicroseconds(1.5, 'hours'))).toEqual('1.5 h');
+      expect(asDuration(toMicroseconds(1.5, 'hours'))).toEqual('90 min');
+      expect(asDuration(toMicroseconds(10, 'hours'))).toEqual('600 min');
+      expect(asDuration(toMicroseconds(11, 'hours'))).toEqual('11 h');
     });
 
     it('falls back to default value', () => {
diff --git a/x-pack/plugins/apm/public/utils/formatters/duration.ts b/x-pack/plugins/apm/public/utils/formatters/duration.ts
index 64a9e3b952b98..8381b0afb5f07 100644
--- a/x-pack/plugins/apm/public/utils/formatters/duration.ts
+++ b/x-pack/plugins/apm/public/utils/formatters/duration.ts
@@ -127,10 +127,10 @@ export const toMicroseconds = (value: number, timeUnit: TimeUnit) =>
   moment.duration(value, timeUnit).asMilliseconds() * 1000;
 
 function getDurationUnitKey(max: number): DurationTimeUnit {
-  if (max > toMicroseconds(1, 'hours')) {
+  if (max > toMicroseconds(10, 'hours')) {
     return 'hours';
   }
-  if (max > toMicroseconds(1, 'minutes')) {
+  if (max > toMicroseconds(10, 'minutes')) {
     return 'minutes';
   }
   if (max > toMicroseconds(10, 'seconds')) {