Google Analytics Screen Time Incorrect when using Measurement Protocol

I am using the measurement protocol for my Tizen TV application since I cannot use the JS (requires a domain name) nor Android/iOS SDKs.

I am sending

{
        v: 1,
        tid: GA_TRACKING_ID,
        cid: data.deviceId,
        t: 'screenview',
        dh: 'something.com',
        dp: encodeURIComponent($location.path()),
        cd: transition.to().title + ($stateParams.gaTitle ? ' (' + $stateParams.gaTitle + ')' : '') || 'Unknown',
        an: 'XXX',
        'ga:mobileDeviceModel': data.deviceModel
}

To https://www.google-analytics.com/collect

But the screen times seem off its always in the seconds eg. 30s etc. I tested staying on page for a long time but it does not seem correctly reflected. I guess its because I only send this hit once and theres no way for Google to know when it stopped? Is there a way to fix this?