I am trying to figure out the best way to 'train' for my 24 Hours of Booty ride the end of June. I want to ride at least 100 miles, but I know better than to expect myself to be ready to ride those miles all at once. I've 24 hours in which to get them done

What is the best way to approach this as far as training is concerned? My thoughts are to first get my (currently non-existent) mileage base up to 25 miles or so, and then work on doing that twice a day once a week, then perhaps in early June doing that three times a day on my long ride day of the week.

Does this sound reasonable, or is there a better approach? Perhaps in early June do one ride in the evening for 25-30 miles, and then do it again twice on the next day? It seems to me best to train for it in the way that I am planning on accomplishing those miles - but we all know how I over-think things...