What is the average findom relationship like?

Hey everyone! I'm really curious how findom usually works. Are you guys paying like per message? Is it more like a friend you can talk to as much as you want as long as you pay once a week? For the women, is it more about the amount you get sent or just being sent money? I guess I'm asking what's the expectation the subs have for the doms and the doms have for the subs?