diff --git a/src/app/ui/duration/string-to-ms.pipe.spec.ts b/src/app/ui/duration/string-to-ms.pipe.spec.ts
index afa8c8fc613..43151976457 100644
--- a/src/app/ui/duration/string-to-ms.pipe.spec.ts
+++ b/src/app/ui/duration/string-to-ms.pipe.spec.ts
@@ -16,4 +16,24 @@ describe('stringToMs', () => {
   it('should not return NaN for just h', () => {
     expect(stringToMs('h')).toBe(0);
   });
+
+  // @covers #3737
+  it('should work improved', () => {
+    // Case: no spaces.
+    expect(stringToMs('1h10m')).toBe(4200000);
+
+    // Case: missing last unit.
+    expect(stringToMs('1h 10')).toBe(4200000);
+    expect(stringToMs('1h10')).toBe(4200000);
+
+    // Case: missing all units.
+    expect(stringToMs('10')).toBe(0);
+
+    // Case: using floats (with dot or comma separator).
+    expect(stringToMs('1.5h')).toBe(5400000);
+    expect(stringToMs('1,5h')).toBe(5400000);
+
+    // Case: combining floats with subunits (opinionated choice: adds up).
+    expect(stringToMs('1,5h 10m')).toBe(6000000);
+  });
 });