Re: How many days a week ?
My formal schedule is
All day Sunday (free and formal classes)
Saturday 2.5 to 3 hours of which I teach a 2 hour class
Thursday night Judo
Wednesday 1.5 - 2 hour class some of my own stuff mostly technical teaching.
Most every other night before I head down the mountain - about 30 minutes self practice. a bit of weights, bokken work and ghost waza (no partner).
I've gone through periods of intense training but right now work and other circumstance dictate otherwise.
How you train is as important as how much.