it all depends on the facility.
When we had a shared use community kitchen available to rent, at it's peak, there were 3 main users. It wasn't that large of a facility. For our kitchen, I and 2 other people had set days. The kitchen was such that only one person/business could process at one time. I usually did Tuesdays, Jamie did tamales and other stuff on Wednesdays and Salyna (who did wedding cakes and other confections) blocked out Thursday/Friday & sometimes Saturdays.
Sometimes, there were other people renting the kitchen for 10-12 hours a day, but they were usually One Time or short term users. In the fall, weddings weren't so busy so Salyna would allow others to take some of her days. I think we also did an unofficial "averaging" of days needed. Us main tenants paid for the set amount of days and unused days could be banked. So the Cake Maker paid for 2 days a week all year and used a lot of her banked days in June/July. Not all kitchens have that flexibility. We also had a committed monthly rate that was less than the per-use/per-hour rate the others had to pay for occasional uses
Some kitchens can have multiple users in there at one time. One shared use/incubator kitchen in Pasco, WA has 4 separate stations, each one seemed to be set up for different operations. I was there briefly about 11 years ago. It seems like there was a section set up specifically for baking with the ovens and such, other sections were more general use and didn't have the banks of ovens.
Note- in just typing this, I remembered a key phrase. "Incubator Kitchen". Might be something to use when searching. Shared use, community kitchen,...
Anyway, to Lao Spice...a person could of grown their business to several days a week in our small kitchen and still have room for others to use the kitchen. As the kitchen was set up as an Incubator Kitchen, the cake maker eventually did outgrow the shared use kitchen and went on to get her own facility. Again, every facility is different.
And don't be afraid to negotiate! If they don't have a X-Hours a month committed and paid for (at a lesser rate) whether you use them or not...might be something to look in to. Maybe they will let you bank the hours paid for. Never know...