I teach secondary maths, so bear in mind that marking is a bit easier in my subject than in some others (although we do seem to mark it more regularly than other subjects in my school so timewise I think it evens out)
I am at school from 8:30-4:30 unless there's a longer meeting, inset, or parents evening. I then spend 3-4 hours in the evening marking and planning, sometimes more, sometimes less (not often less, except when y11 and y13 have left and I've got gained time). I've just finished my 13th year of teaching, so this is much less than I used to do in the first couple of years.
I was about to say I don't work in the holidays, but I do, I just dont go into school to do it. I run a residential trip in the Easter holidays, so that's one week where I'm working all the time. This summer I'm learning the new Alevel syllabus which I'm teaching for the first time in September, some of it is brand new to me, other parts are familiar but in a new format. The textbooks haven't arrived yet, we've had one inspection copy that 4 teachers are trying to plan from
, and we don't know when they will actually arrive. That's before we even think of the exams, we've had very little in the way of sample assessments yet.
I really do enjoy my job now, but I work in an "outstanding" school (we haven't been inspected for a few years so we might not be outstanding in the next Ofsted), with a fairly supportive SLT. We aren't micromanaged like some schools do, we're trusted to do our jobs professionally in our own way. Some schools expect to see detailed planning for every lesson in their format, and prescribe how marking is done, mine doesn't, we are trusted to plan lessons in the way we like, and mark effectively for our classes.