I read that coroutine delays are not precise. What will cause a

delay

to take longer than the specified time? And do you think this will work to get the actual passed time after a delay (for example for a countdown timer)?

val timeBefore = SystemClock.elapsedRealtime()
delay(TICK_DELAY)
val timeAfter = SystemClock.elapsedRealtime()
val passedTime = timeAfter - timeBefore

measureTime { }

from the stdlib should suit your needs. If the Dispatcher, or the VM/machine is short on resources, as can be seen when your computer freezes, the actual delay will be longer than requested.

thank you for the info!