If you're in a small team, you get to know everyone, and cross-pollinate the various skills some individuals may have over others. The groove and "team gel" happens within a couple of weeks.

It's not for everyone, and there are some "consulting" individual contributors here and there, but the point is to have a sustainable pace that's always "busy" and everyone is "checked in" rather than have a few weeks of "crunch time" to meet a deadline. Some need to "check out" for a while, that's also fine.

Most product cycles last 3-4 months, and it's up to you if you want to switch teams. some don't.