I only manage, because I refuse to work in the evenings now. I may read emails and respond to any urgent ones at my convenience and I may do an hour or two at the weekend planning, but I am at work between 7 and 5 during the week and doing 50 hours when paid for 35 is what I consider any "reasonable" time on top of my directed hours.
Do I meet every deadline? No. I do what I consider necessary to teach and assess my students and support those with extra needs where I can. Pointless paperwork can and does wait until the rare occasion I have some extra time or I actually get asked for it (even rarer).
I also use my students in form time to sort out displays, do errands like taking recycling and delivering messages or get paper/ pens/ books from resources. They love it, because it gets them out of pointless morning tasks.
We have to supervise our own detentions, so the kids there get to tidy up, sharpen pencils, cut out card sorts, stick sheets in or whatever else helps me as a "restorative justice" task.
Marking is done on exam questions only and I can mark those during break/ lunch or during independent tasks. I use stamps during lessons to show I have looked at the rest of the work and to show I have acknowledged any responses to marking - the kids often hand their books to me open on the day's page before they go in book boxes, so I can do it there and then.
Anything else, like data entry on books is done in lesson time - I don't waste my own time to do that.
It takes a "fuck-it" attitude to a lot of things to manage with young children. I am full-time in a shortage subject with a substantial TLR (one extra free a fortnight for the money) and with an autistic teen and a toddler at home.