I average 5-10. I put in a solid 2 hours on a Saturday, maybe 2 on a Sunday morning in between cooking and housework. I might grab an hour on a week night or two, so about 6 a week is normal.

Just short sessions like that keep me interested, and I can mull the events rather than running them together. I have gorged on EB (eg when I first got it) with a 5-6 hour session but I just got a headache, and Makedon-fatigue.