If u haven't updated your phone yet then do it because it actually makes it better and more accurate to estimate how long it would take i have updated my s25ultra and its gotten a bit better.

That's a lil more than normal so I would suggest check ur settings and see what background stuff are always up and also if u haven't done this yet set your performance profile to light it would help and also download Samsung's good guardian from the ...

You have just purchased the phone its normal to feel the phone heat up as the phone is still trying to learn your usage patterns and setting itself up give it a week or so and you see it get back to normal.