Just wondering when the shortest and longest times between hive inspections should be?
I dont want to not know what is going on in my hives, but also dont want to disturb them too much?
Depends, if checking for queens and requeening then inspections every day or up to every third day can be the norm.
If you have queenright hives and just need to check on development then once every 10 days to 2 weeks is fine.
If you're just interested in the honey crop then pile the supers on in April or May and remove them in Late August to Early October.
If you;re interested in the bees, kand want to keep them healthy and productive then do the 10 days to 2 weeks.