diff --git a/services/web/frontend/js/shared/utils/time.ts b/services/web/frontend/js/shared/utils/time.ts
index 4ce1350659..77a9855287 100644
--- a/services/web/frontend/js/shared/utils/time.ts
+++ b/services/web/frontend/js/shared/utils/time.ts
@@ -4,8 +4,10 @@ export function formatSecondsToHoursAndMinutes(
   t: TFunction,
   seconds: number
 ): string {
-  const hrs = Math.floor(seconds / 3600)
-  const mins = Math.floor((seconds % 3600) / 60)
+  // round up: the caller tells the user how long to wait, so never understate
+  const totalMinutes = Math.ceil(seconds / 60)
+  const hrs = Math.floor(totalMinutes / 60)
+  const mins = totalMinutes % 60
 
   const parts = []
 
diff --git a/services/web/test/frontend/shared/utils/time.test.ts b/services/web/test/frontend/shared/utils/time.test.ts
new file mode 100644
index 0000000000..175ec54b9e
--- /dev/null
+++ b/services/web/test/frontend/shared/utils/time.test.ts
@@ -0,0 +1,64 @@
+import { expect } from 'chai'
+import { TFunction } from 'i18next'
+import { formatSecondsToHoursAndMinutes } from '@/shared/utils/time'
+
+// stands in for i18next, echoing the key and its count
+const t = ((key: string, options?: { count?: number }) =>
+  options?.count === undefined
+    ? key
+    : `${options.count} ${key}`) as unknown as TFunction
+
+const ONE_HOUR_IN_SECONDS = 3600
+const ONE_MINUTE_IN_SECONDS = 60
+
+describe('formatSecondsToHoursAndMinutes', function () {
+  it('joins hours and minutes - 3h 25m', function () {
+    expect(
+      formatSecondsToHoursAndMinutes(
+        t,
+        3 * ONE_HOUR_IN_SECONDS + 25 * ONE_MINUTE_IN_SECONDS
+      )
+    ).to.equal('3 time_hour time_and 25 time_minute')
+  })
+
+  it('omits minutes for a whole number of hours - 2h', function () {
+    expect(formatSecondsToHoursAndMinutes(t, 2 * ONE_HOUR_IN_SECONDS)).to.equal(
+      '2 time_hour'
+    )
+  })
+
+  it('omits hours for under an hour - 25m', function () {
+    expect(
+      formatSecondsToHoursAndMinutes(t, 25 * ONE_MINUTE_IN_SECONDS)
+    ).to.equal('25 time_minute')
+  })
+
+  it('rounds a part-minute up - 25m 30s', function () {
+    expect(
+      formatSecondsToHoursAndMinutes(t, 25 * ONE_MINUTE_IN_SECONDS + 30)
+    ).to.equal('26 time_minute')
+  })
+
+  it('rounds up to a minute for under a minute - 30s', function () {
+    expect(formatSecondsToHoursAndMinutes(t, 30)).to.equal('1 time_minute')
+  })
+
+  it('rounds up to a minute for a fraction of a second - 0.5s', function () {
+    expect(formatSecondsToHoursAndMinutes(t, 0.5)).to.equal('1 time_minute')
+  })
+
+  it('carries a rounded-up minute into the hours - 20h 59m 30s', function () {
+    expect(
+      formatSecondsToHoursAndMinutes(
+        t,
+        20 * ONE_HOUR_IN_SECONDS + 59 * ONE_MINUTE_IN_SECONDS + 30
+      )
+    ).to.equal('21 time_hour')
+  })
+
+  it('adds a minute just past a whole hour - 1h 1s', function () {
+    expect(formatSecondsToHoursAndMinutes(t, ONE_HOUR_IN_SECONDS + 1)).to.equal(
+      '1 time_hour time_and 1 time_minute'
+    )
+  })
+})