I sure support the notion of riding as many miles as you can. However, I think you need a graduated plan that increases mileage while also giving you structured rest days. When preparing for long rides I've always found the ideal to be riding enough that I can comfortably complete three-fourths of the event's distance with ease. Hence, in your case you may want your training schedule structured to have three consecutive days of increasingly longer rides until you can comfortably ride 75 miles a day three days in a row. For example: Week 1: Monday - rest; Tuesday - 20 miles; Wednesday - 20 miles; Thursday - 20 miles; Friday - 10 miles; Saturday - 10 miles with hills; Sunday - 10 miles. Week 2: Monday - rest; Tuesday - 30 miles, Wednesday - 30 miles, Friday - 30 miles, etc. The actual amount of increase in your long day rides should be governed by your recovery between days. If you find it difficult to sleep, you're probably over training and may need to cut back. I would know my resting heart rate and monitor this closely each morning. If I find that it is creeping up by 5 - 8 %, I'd cut back in the miles slightly. I also agree that a trip to the Long Distance thread is a good idea. There are lots of "century training schedules/guides" that can be found by doing a simple Internet search. Keep in mind, however, that they are just guides. You may find your body allows you to progress faster or slower than the guides indicate.