My experience of teaching:
target setting, recording, paper work, unblocking the photocopier, contacting parents, recording contact with parents, collecting "performance management " evidence, replying to emails, providing up to date class profiles for learning walks, statistical analysis, "drilling down" into results, colour coding registrars and record sheets, transferring information from one data base to another, attending meeting, "sharing good practice" etc etc etc etc etc etc etc etc etc etc
roughly 50 hours per week.
planning, teaching, marking, would require a further 50 or so hours a week to do properly, but I do need to eat/sleep/travel/ see my family, so there obviously isnt time for this, and to be honest, it matters less to schools than the first paragraph.
So since resigneing from teaching, I have done supply, consultancy and TA work
10 x the amount of teaching! half the pay, but about 4 x the pay per hour ( teaching is well below the national minimum wage per hour in most cases - there are a few lucky ones with better jobs, but you tend to find if the teachers are well treated, the management themselves are making the sacrifices)
Quality of life since leaving teaching up approximately 500%