I try to rehearse weekly, just to keep the interest and because it's fun. I also like a tight ship!
We rehearse at my place in headphones using a jamhub. The basement is a rehearsal space, which is just so much better than driving to a studio, setting up, getting levels, volume wars then taking it all down.
With the jamhub We each have our own private, preferred mix and volume level, the sound quality is fantastic, it's all right there in your ear, no more 'what are you playing?' Moments. It's all set up, walk in, pick up guitar/bass/sticks and play