I'd say it depends on the setup...
I saw videos from this girl on youtube "crab central station" a while back and her setup is insane...it takes a whole room
dry areas..transfers areas...."crab wheels" lots of stuff
her setup is like tank upon tank upon tank upon tank I 100% suggest you guys check her out
she also explains lots of stuff about crabs...shell exchange...
from what I remember she had a tank which was the "shell shop" where crabs went into to "buy" their new shells lol
very detailed setup but I'm not sure that it is for everyone