During our Oftsed, teachers were criticised for keeping children on the carpet too long and also for sending them off to their tables too quickly so they didn't know what they were doing-grrr!
Have you been told an ideal format or not? We've been told that we shouldn't look on it as a tick box exercise but then it's horrible being criticised when you don't get it right!
I think for an observed lesson, maybe probably 15/20 minutes on the carpet with input and paired activities with whiteboards-sending off more able early if appropriate, then 20/25 minutes at their tables with the wonderful mini-plenaries to keep things on track, then 10/15 minutes whole class plenary-with circle activity or paired work.
Or am I deluding myself!?