I took a couple days off during my TransAm, so only 30 or so days in a row on that trip. The days off helped me recover, recharge, and stay excited for the remainder of the trip.
I think my maximum consecutive riding days was around six or eight weeks. Late in that streak, and shortly afterward, I came to the recognition that (a) I wasn't getting paid for that; (b) I liked riding a bike because it was fun; and (c) after riding that many consecutive days through the summer heat, it didn't seem like that much fun any more.
So now I don't count consecutive riding days. If I'm tired, or the weather's miserable, I don't ride that day. Funny thing is, without the pressure, even a ride the next day in pouring rain seems fun again.