That very much depends on who is available and when.
At the moment we've not got any gigs until December, so we meet up for 4 hours about once a month to run through some new ideas - we're in a writing phase.
We'll probably have a couple of four hour rehearsals in the 10 days before our next gig trip (Sicily 7th Dec).
We've been together for donkey's years - we don't need much rehearsing - it's all in the muscle memory.
I do miss it when we're in this kind of between gigs phase.