If you were easily able to do 25 / 30 miles and had been doing so regularly for 6+ months but were looking to increase and build up your distance without incurring any strains / injury how much would you step up by and would you then do the new longer distance for just 1 or 2 rides or more like 4 / 5 before jumping up again. Also what would be your biggest jump from say a level you'd trained to for something like an event / a sponsored ride.

I did a 52 miles sponsored ride at the end of September which did result in some strains possibly due to not enough training at longer distances in the run up to it but want to do a 100 miles this summer just as a personal goal having taken up cycling more seriously in the last 1 1/2 yrs.