Three quite recently bought different timers when they count up and get
to twenty minutes they start all over again counting only up to twenty
minutes.
Whereas older timers don't do this, they count up to nine hours or
nineteen hours.
What might be a reason for these newer timers to be like this?
Especially since there are applications like doing a roast over several
hours, where its convenient to have one timer counting up and another
counting down at the same time.