How do I see how much time I have remaining when I set an alarm to wake up?

I hate my new iPhone. I have been using android for 17 years and I’m trying to adapt but the alarm is driving me crazy. How do I see how much time I have remaining when I set an alarm to wake up? Samsung does this by default by saying 6 hours remaining. Is there another app or something? I know it’s simple math but when I’m in a new time zone every week exhausted from Travel and planning by morning I like to ensure I’m getting 7 hours and adjusting the wake up alarm.

also, how do I schedule texts in iOS? This is again default in Samsung and driving me crazy.

​[Re-Titled by Moderator]