Time between feedings

My daughter will be 20 weeks on Wednesday. We are transitioning to formula and she is almost completely done with breastmilk. Problem is, she thinks she needs to eat every 2 hours ON THE DOT. It’s like she can tell Tim because it’s clockwork.

I’m trying to stretch her a little longer each day especially since she’ll be on formula all the time but she screams bloody murder. Do I just let her cry for 15 minutes? I try everything to distract her and she just doesn’t care about anything but eating. Any advice?