Task Timeout

Timeout.cs

var cutoff = 30000;
using (var delayCancellation = new CancellationTokenSource())
{
    var mainTask = Task.Run(() =>
    {
        // Whatever needs doing...
    });

    var delayTask = Task.Delay(cutoff, delayCancellation.Token).ContinueWith(async t =>
    {
        // Continue to wait for task to complete and do something else with the result
        var result = await mainTask;
    }, TaskContinuationOptions.NotOnCanceled);

    if (await Task.WhenAny(mainTask, delayTask) == mainTask)
    {
        // Task completed before cutoff
        delayCancellation.Cancel();
        var result = await mainTask; // re-await in case of fault/exception to allow for rethrow
    }
    else
    {
        // Task did not complete before cutoff - inform user, write to log, etc.
    }
}