How to track how longer user is on app for react native

I am trying to count in minutes and hours how longer a user is on the app for and display it. I have got the app counting minutes I just cant seem to work out how to track when the app is active or not. Theres documentation on appState but I cannot figure out how to incorporate this into counting. Here is my code:

function Overview() {const appState = useRef(AppState.currentState);const [appStateVisible, setAppStateVisible] = useState(appState.current);const [count, setCount] = useState(0);const [active, setActive] = useState(false);useEffect(() => {    const subscription = AppState.addEventListener("change", nextAppState => {        if (appState.current.match(/inactive|background/) && nextAppState === "active") {            setActive(true);        }        appState.current = nextAppState;        setAppStateVisible(appState.current);        console.log("AppState", appState.current);    });    return () => {        subscription.remove();    };}, []);useEffect(() => {    const id = setInterval(() => setCount((oldCount) => oldCount + 1), 1000);    return () => {        clearInterval(id);    };}, []);return (<View style={{margin: 32}}><View style={{marginBottom: 32}}><Text style={{fontSize: 36, fontFamily: 'Roboto_400Regular'}}>Great!</Text><Text style={{fontSize: 16, color: '#878787', fontFamily: 'Roboto_400Regular'}}>Average mood 23%</Text></View><View style={{flexDirection: 'row', justifyContent: 'space-between'}}><OverviewContainer title="Weather" value="14 C" /><OverviewContainer title="Time on app" value={`${(count/60).toFixed(0).toString()} mins`} /></View></View>);}

Any help on putting the two together be great, thanks :)