My wife has gone deep on the issue of adequate lunch time in our community, working with the school, local, and state officials and PTA to try to improve this. If you’re interested in learning more she’s compiled a lot of (U.S. centric) research resources here:

https://docs.google.com/document/d/1-LfGAhkmiy_sZWGCMDyus59X...

Highlights for me:

-lots of inertia, but it’s mainly logistical rather than ideological

-change can garner bipartisan support

-we spend quite a lot of money to get fresh fruit & veg in front of school kids and then don’t give them enough time to eat it