diff --git a/.changeset/cost-insights-wet-walls-jog.md b/.changeset/cost-insights-wet-walls-jog.md
new file mode 100644
index 0000000000..8de3037f19
--- /dev/null
+++ b/.changeset/cost-insights-wet-walls-jog.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-cost-insights': minor
+---
+
+convert duration + last completed billing date to intervals
diff --git a/plugins/cost-insights/src/api/CostInsightsApi.ts b/plugins/cost-insights/src/api/CostInsightsApi.ts
index 7f7aad333a..26676be8b7 100644
--- a/plugins/cost-insights/src/api/CostInsightsApi.ts
+++ b/plugins/cost-insights/src/api/CostInsightsApi.ts
@@ -18,7 +18,6 @@ import { createApiRef } from '@backstage/core';
 import {
   Alert,
   Cost,
-  Duration,
   Entity,
   Group,
   Project,
@@ -38,15 +37,9 @@ export type ProductInsightsOptions = {
   group: string;
 
   /**
-   * A time duration, such as P3M. See the Duration type for a detailed explanation
-   * of how the durations are interpreted in Cost Insights.
+   * An ISO 8601 repeating interval string, such as R2/P3M/2020-09-01
    */
-  duration: Duration;
-
-  /**
-   * The most current date for which billing data is complete, in YYYY-MM-DD format.
-   */
-  lastCompleteBillingDate: string;
+  intervals: string;
 
   /**
    * (optional) The project id from getGroupProjects or query parameters
diff --git a/plugins/cost-insights/src/components/ProductInsights/ProductInsights.tsx b/plugins/cost-insights/src/components/ProductInsights/ProductInsights.tsx
index 52abe3fd8b..0ef35bf04c 100644
--- a/plugins/cost-insights/src/components/ProductInsights/ProductInsights.tsx
+++ b/plugins/cost-insights/src/components/ProductInsights/ProductInsights.tsx
@@ -21,7 +21,7 @@ import { useApi } from '@backstage/core';
 import { costInsightsApiRef } from '../../api';
 import { ProductInsightsCardList } from '../ProductInsightsCard/ProductInsightsCardList';
 import { Duration, Entity, Maybe, Product } from '../../types';
-import { DEFAULT_DURATION } from '../../utils/duration';
+import { intervalsOf, DEFAULT_DURATION } from '../../utils/duration';
 import {
   DefaultLoadingAction,
   initialStatesOf,
@@ -75,8 +75,7 @@ export const ProductInsights = ({
         group: group,
         project: project,
         product: product.kind,
-        duration: duration,
-        lastCompleteBillingDate: lastCompleteBillingDate,
+        intervals: intervalsOf(duration, lastCompleteBillingDate),
       });
     },
     [client, group, project, lastCompleteBillingDate],
@@ -97,8 +96,7 @@ export const ProductInsights = ({
               group: group,
               project: project,
               product: product.kind,
-              duration: DEFAULT_DURATION,
-              lastCompleteBillingDate: lastCompleteBillingDate,
+              intervals: intervalsOf(DEFAULT_DURATION, lastCompleteBillingDate),
             }),
           ),
         ).then(settledResponseOf);
diff --git a/plugins/cost-insights/src/components/ProjectGrowthAlertCard/ProjectGrowthAlertCard.test.tsx b/plugins/cost-insights/src/components/ProjectGrowthAlertCard/ProjectGrowthAlertCard.test.tsx
index db3f2f9bf6..0e24f042bc 100644
--- a/plugins/cost-insights/src/components/ProjectGrowthAlertCard/ProjectGrowthAlertCard.test.tsx
+++ b/plugins/cost-insights/src/components/ProjectGrowthAlertCard/ProjectGrowthAlertCard.test.tsx
@@ -27,6 +27,9 @@ import { AlertCost } from '../../types';
 import { defaultCurrencies } from '../../utils/currency';
 import { findAlways } from '../../utils/assert';
 
+// suppress recharts componentDidUpdate deprecation warnings
+jest.spyOn(console, 'warn').mockImplementation(() => {});
+
 const engineers = findAlways(defaultCurrencies, c => c.kind === null);
 
 const MockProject = 'test-project-1';
diff --git a/plugins/cost-insights/src/index.ts b/plugins/cost-insights/src/index.ts
index 28bdb1a8b3..7cd0456ad1 100644
--- a/plugins/cost-insights/src/index.ts
+++ b/plugins/cost-insights/src/index.ts
@@ -21,5 +21,4 @@ export * from './components';
 export { useCurrency } from './hooks';
 export * from './types';
 export * from './utils/tests';
-export * from './utils/duration';
 export * from './utils/alerts';