I don't know how schools have reduced learning time because of covid, let alone deciding to make those fewer learning hours a permanent thing. Teachers have directed hours as part of their contract - 1265 hours a year - we have to work them.
Every school I know has changed the day around if they needed to for staggered drop offs and pick ups/social distancing etc. If they had to do that, then the school day breaks were reduced or increased to compensate. I get 45 minutes less break from contact time at the moment between 8.30 and 2.45, than I did between 8.40 and 3.15. Might feel to the parents that we finish really early, but the day is most definitely 'done' by 2.45. Kids are done for learning by 1.30 I'd say. My own child's school hasn't changed their hours, but every classroom has its own door to the playground, so no need to stagger anything. If I discharged my class straight out of the classroom down they'd drop 4 storeys.
I find it really interesting to hear how exhausted so many people find children to be by 2.30. My primary aged children definitely aren't.
Mine isn't exhausted for running around outside, playing lego, singing, dancing etc... but she can't retain any new information. She's already spent 5 hours retrieving recently learned information, and being exposed to new learning however, that's plenty of cognitive load for one day.
If I'm going to get paid 8% more for working 8% more hours, then fine. But I'd work just those hours. Goodwill has been somewhat sucked dry over the last 18 months.