Seeking battery/SOT reviews

Hi, everyone. I hope this post finds you in good health. I never had any iphone and I was recently thinking about getting an Iphone 11 Pro. The unit I'm looking at has a battery health of 78%. I'm a heavy user and I don't know long it's going to last me a day. That's why I'm curious to learn how much screen on time are you guys getting with a battery health below 80%? Thank you in advance!