Ok, I'll aim for 11!
He hasn't really done a 4hr A before, not on purpose anyway! But I'll give it a go and see how he does. We would ideally like a Bt no later than 7.30, but I would do 8 if it meant he slept in later. However when we have done a 7.30 Bt it doesn't seem to lead to later Wu. It's been a mixed bag Really, sometimes a better Wu, sometimes not, sometimes a nw then a better Wu. So I'm not sure really.