Inexorable Cycling Ramp-Up

I missed the GA 400 Century, but I’d love to have done it. I’m pretty far from the endurance needed to complete a 100 mile stint, but I’m very interested in getting there! In the meantime, I’ve started riding to work again about once a week. That gives me a little over 20 miles I can put in a week. Maybe not enough training to get me anywhere fast, but I may be able to extend commute up to the total of 80 miles I normally travel (round trip).