Try 3 week sprints. Or 4. ShapeUp by Basecamp recommends 6 weeks. Sticking to the same things everyone is doing is counter agile, and you should be experimentin

Try 3 week sprints. Or 4. ShapeUp by Basecamp recommends 6 weeks. Sticking to the same things everyone is doing is counter agile, and you should be experimenting and see what works for your team