I think you could do a Century in 10 weeks. I'd do my long Sunday ride like this: 20,25,30,35,40,50,60,70,80,Century. 50, 60, 70 will probably be tough. Eat a lot during the long rides!! I'd get at least two rest days during the week. And 10,15 or 20 miles the other days. And that's building up quite quickly, so watch very carefully for any aches and pains that don't resolve by the next ride. And if things don't go exactly on schedule, do the metric Century option, 62 miles, and you're well on your way for the next one that comes up!

Nanci