My limit is twice a week. Anything more than that is not fun for me.
In part this is because I do weight training twice a week, and too much cycling makes me feel tired, like I never recover from a ride or a workout. But it could also be because I have to work five days a week and I find that I need time to relax and do nothing as part of the stress management for that. If I were working less, I might enjoy riding more days per week.
BTW I ended up not riding last night. It looked like thunderstorms would hit the area during the ride. As it turned out, the rains storms fizzled out, but there was lightning in the area during the time that I would have been riding so cancelling was a good call. The weather forecast indicates that the overnight/morning rain showers should be gone by this evening, so I'm going out tonight instead.

