أحسن الله إليك Is it a bidah to pray between sunrise and duhur every day since the prophet (صلى الله عليه وسلم) didn’t pray it every day?

You can pray whenever you want because you have time and it is convenient for example as long as it is not a forbidden time. Sometimes don't do it every single day and don't consider it a Sunnah, of course, because if you do consider it a sunnah then it becomes a bid'ah