Weight training is quite different from cycling. I used to be a body builder, I trained quite intensely with a coach for 2 years. Yes, with weight training, you do want to arrange your workouts so that you've got 72 hours of recovery time because of the intensity at which you are working ... you're doing the reps to failure.

When I worked out, my coach divided my workouts into three. Day 1 - legs, abs, cardio. Day 2 - back, biceps, abs, cardio. Day 3 - shoulders, triceps, chest, abs, cardio. Day 4 - off (although I could go for a walk or light bicycle ride if I wanted). Day 5 - back to the legs etc. again. That kind of training gave the various muscles time to rest in between the workouts.

But with cycling you don't have to do that ... cycling is not always that intense. It's more about cardio and endurance, especially the kind of training we're talking about here. I've been cycling avidly for 23 years now ... I've been a randonneur for 12 of those years ... I've toured quite extensively ... I've commuted regularly ... and I've raced. I've got a reasonable idea of what can work.

Many cyclists, myself included, regularly ride 5-6 days a week. It is generally considered a good idea to take at least one day off each week, and it is generally considered a good idea to mix up the rides so that you do a couple long ones, a couple shorter more intense ones (ride hills, ride intervals, ride at a faster speed), and at least one recovery ride.

If the OP starts riding a relatively short distance (whether it is a commute, or an after-work ride) 3-4 days a week, and does back-to-back longer rides on the weekends, as I suggested in Post #8, he'll be ready to roll in a couple months. He has already done 70 mile rides in the past, so he should have a reasonable fitness level to work with. I suspect he could go out now this coming weekend and ride 40 miles on Saturday, and then 30 miles on Sunday, and then 20 miles on Monday ... at a long, steady distance pace ... and feel just fine.