Seriously though OP, you just don't have a clue how much time is involved in teaching.
OK, it's partly my choice as I'm newly qualified/ newly in role, but I'm planning 10 lessons a week. That's at least 10 hours outside teaching hours.
I have to mark or look through about 450 pieces of work in a standard week. OK, some gets done in lessons, but so you know. I have to work on my displays. I'm currently writing 30 reports with 5 sections of writing, which involves knowing/ verifying the interests of every child in and out of school, as well as all their strengths/ development points over four subjects. Fair enough, I have most of this in my head, but there are always some children you have to spend time looking into, because it's hard to find positives to share. Then there's subject leader work, other school initiatives to manage, class assembly, trips to plan, training to do and prepare for, meetings to attend, parents to call, behaviour incidents to log. And more. In school time, I work until 6pm each day at school, then do about 2 hours at home each night. In half term I work about 2-3 days prepping for the new term and catching up. At weekends I'll work most of one of the days.
I fully respect that as a new teacher, I've got more to do than others - I'm preparing things I will use to make up my displays and resources; I'm doing more training. I've not delivered the lessons before, so there's more reflection. I'm less experienced, so I'm slower preparing slides and thinking about content. But even so, there's still lots to do, and you're essentially giving me a 5-hour swing each day by taking away time I use to plan, whilst adding to my workload?