$sleepDuration = Get-Random 2,3
$ps = [powershell]::Create().AddScript("Start-Sleep -Seconds $sleepDuration; 'Done!'")

# execute it asynchronously
$handle = $ps.BeginInvoke()

# Wait 2500 milliseconds for it to finish
if(-not $handle.AsyncWaitHandle.WaitOne(2500)){
    throw "timed out"
    return
}

# WaitOne() returned $true, let's fetch the result
$result = $ps.EndInvoke($handle)

return $result