You can always just use your body timer - sit until your mind gets sluggish or you feel like you've stopped making progress. Usually this happens arount 45m to 1h for most people.
Watch timer / alarm also works.
You can always just use your body timer - sit until your mind gets sluggish or you feel like you've stopped making progress. Usually this happens arount 45m to 1h for most people.
Watch timer / alarm also works.