We are limited on how long the permits let us work in the scholl. The maximum we can do is about 4 hours a night on weekdays, and 8 hours on saturday. We sometimes eke a little bit of extra time out earlier and later than our meeting times here and there, so I'd say a maximum UPS workweek is 30-32 hours.
I am somewhat jealous but also relieved that we don't have an external shop with unlimited time
