Depends on if it's combat or not. If it's not combat, I generally go with Rule of 3. Three poses after yours, you can go again so long as it's not an action pose, this is pure social because large scenes tend to devolve into circles responding to each other anyways since 10 people rarely have a conversation. It's one person talking, 3 people listening, 3 other people talking about something else, and a pair of people mocking everyone.
For combat scenes I have the five minute rule. Pre-type your actions so that you can declare easy and roll then pose the attempt/effect whatever.
It's still a long thing depending on how many npc's there are and whatnot but that's what I do.