chore: replace hardcoded values with a constant

ui/hooks/bridge/useCountdownTimer.ts

@@ -5,7 +5,15 @@ import { getBridgeQuotes } from '../../ducks/bridge/selectors';
 // TODO: Remove restricted import
 // eslint-disable-next-line import/no-restricted-paths
 import { REFRESH_INTERVAL_MS } from '../../../app/scripts/controllers/bridge/constants';
+import { SECOND } from '../../../shared/constants/time';
 
+/**
+ * Custom hook that provides a countdown timer based on the last fetched quotes timestamp.
+ *
+ * This hook calculates the remaining time until the next refresh interval and updates every second.
+ *
+ * @returns The formatted remaining time in 'm:ss' format.
+ */
 export const useCountdownTimer = () => {
   const [timeRemaining, setTimeRemaining] = useState(REFRESH_INTERVAL_MS);
   const { quotesLastFetchedMs } = useSelector(getBridgeQuotes);
@@ -20,8 +28,8 @@ export const useCountdownTimer = () => {
 
   useEffect(() => {
     const interval = setInterval(() => {
-      setTimeRemaining(Math.max(0, timeRemaining - 1000));
-    }, 1000);
+      setTimeRemaining(Math.max(0, timeRemaining - SECOND));
+    }, SECOND);
     return () => clearInterval(interval);
   }, [timeRemaining]);