At the moment, I practice between 30 minutes and an hour a day. I’m trying to play the head of Mike Stern’s “Chromazone” at tempo, which is revealing some problems with my picking. It’s sixteenth notes at 120 bpm, minimum, which is kind of an intermediate zone between slower and faster runs that I’ve always had some trouble with.
I’ve also had some nerve damage in my neck that affects the last two fingers on the left hand. It’s much better than it was a couple of years ago but I notice those fingers don’t respond as fast as I expect them to without quite a bit of warm-up. Up tempo tunes like Chromazone reveal issues with hand synchronization accordingly.
Practice usually consists of picking exercises to focus on building speed and synchronization, one or two scale fingerings, playing Chromazone and jamming over a random backing track, ideally one I haven’t heard before.
There was a time when I practiced between four and six hours a day, but I’m lucky to get an hour at a stretch now.