In September I'm going to tackle my first 100 mile ride
. The most I've done in one day was 78 as part of London to Paris last year. That was punctuated by multiple stops however as I was in a big group and we were taking it easy. On the ride I'm planning there'll be some time pressures so I need to crack on.
Should I plan rest stops, i.e. 2 hours then rest, 2 hours then rest etc., or should I just see how I feel at the time? On the one hand a target of 2 hours seems good as I should be able to cover 30 miles or thereabouts which sounds a good target before a break. Doing it that way also breaks the journey up from being 100 miles into 3 or 4 smaller journeys which mentally is easier to focus on.
Any thoughts?

Should I plan rest stops, i.e. 2 hours then rest, 2 hours then rest etc., or should I just see how I feel at the time? On the one hand a target of 2 hours seems good as I should be able to cover 30 miles or thereabouts which sounds a good target before a break. Doing it that way also breaks the journey up from being 100 miles into 3 or 4 smaller journeys which mentally is easier to focus on.
Any thoughts?