Habba,
I mark - per day - 28 English books, 24 Maths books, and 33 books of at least 2 other subjects. That is simply marking of what is done in lessons. I also 'level' sudents across a range of their work periodically - which isn't exactly marking, more a kind of 'meta marking' of already-marked work. Some is 'ticking' type marking, but the vast majority - I would say most books on most days - requires proper '2 good things and a developmental comment' type marking.
I also plan (weekly) and prepare resources for (daily) at least 5 lessons a day (depending on the timetable).
None of this is done in my actual teaching hours, with the exception of 1.5 ours of non-contact time once a week when I normally catch up ith e.g. displaying work, year group meetings, work towards my personal targets etc. I do normally manage to get one set of books done at luntime UNLESS I am working with a child or dealing with issues that arise or...or...or, you get the kind of thing.
I do mark homework several times a week - I have just prepared 33 individually-worded certificates to present to children as a result of their latest project homework - but it is not a major part of my marking load. the in-class work is much more significant.
Of course, at some times of the year, things like reports, paperwork related to SEN etc have to be created / revised and that is added to the above daily list.