Teachers in maintained schools aren’t expected to just work their directed hours. They are expected to work their directed hours plus “such reasonable additional hours as may be necessary to enable the effective discharge of the teacher’s professional duties”
Obviously the key word is “reasonable” and people will have different views on what is reasonable!
If your colleagues are able to fulfil all their responsibilities within directed time, good for them, but if they are not able to do so, they should be prepared to work some additional hours if necessary. I think, however, that it would be very difficult to suggest that it would be reasonable to expect someone to work an 11 hour day.
More generally, I agree with you that Ofsted affects SLT the most - and in particular the headteacher.
It’s interesting, and depressing, to read that the headteacher has piled on additional work because you are expecting Ofsted. My daughter’s only experience is very different. The head told all staff that he was expecting an Ofsted visit in the next few months, but that they should not worry about it or do anything different, because they were doing everything right and there was no need to do anything more.
Ofsted came, sat in on one of my daughter’s lessons, had a chat with her during break, and seemed genuinely interested in what she was saying. She said the whole experience was remarkably stress-free and the headteacher’s approach was obviously a big part of that.