I am an ex primary teacher and never, ever got it all done. I taught in four schools and each was as bad for workload, but in different ways.
I worked 0745 till about 5.30 in school. I would then do about 90 minutes at home in the evening four nights a week. Nothing on Friday night or Saturday. Worked for most of the day on Sunday.
I hated never having a weekend. I was constantly behind. I hated the feeling of always having work that I should be doing. By seven years I was pretty much burned out and began finding it harder and harder to generate lesson planning ideas. It was as if my creativity had dried up. I carried on for another few years, but was probably quite lucky to avoid a breakdown or succumbing to unhealthy means of escape.
If I was ever looking to go into it again I would:
Pick a two-form entry school, as that shares out the workload both for planning and subject coordination, when that comes along.
Look closely at the school's approach to curriculum planning and swerve any school that talks about reinventing the curriculum every year.
Make much more use of published resources.
Controversial, but I would consider taking the occasional sick day at peak workload times such as report-writing. I once looked at the word-count on my class reports document: it was 30,000 words, all of which I'd had to write in my own time on top of day-to-day teaching.