The CS Policy is the same for everyone covered under it, which includes Facilities Maintenance, GSE, Fleet Service and Cargo employees. Aircraft Maintenance has their own process. It used to be that all stations in the system could have different policies, but they were all superseded by the current policy.
It is unlimited if you work, but if you give away you'd need to work at least 50% of your scheduled hours in a 6 month period. If you work a 7 day week you could work up to 16, 16, 14, 16, 14, 16, 14 hours per day.
Hopefully, Aircraft Maintenance could also get these policies. They're there for everyone else, if they want them.
I know the US people may not need to get approval, but the language is in the CBA. In contrast, the ability to CS is on an automated system in which the changes could be made and it could be split up between 3 people, if needed.