I certainly hope these people aren’t driving themselves to work with this schedule. In addition I hope no one on it has a heart condition.
https://www.cdc.gov/niosh/docs/2004-143/pdfs/2004-143.pdf
https://pmc.ncbi.nlm.nih.gov/articles/PMC6617405/
The sweet spot for 12s is in having 4 days off per week. There isn’t time for anything in life on work days except work, sleep, commute. Thirdly, the first day off is a wash. Recovery. Like a nap that simply goes on all day. 12s are great but only with block scheduling and days off.
This schedule proposal sounds like something out of pre-OSHA, possibly intended to kill people. Live to work, not the other way around.