Same issue here. My annual WI ride (starts tomorrow) does 75-100 mi/day and we always stop for a 1hr+ lunch. It's like starting all over again with dead legs. We just start up slow and work back into a pace. Our short stops are often too long for me as well. I prefer to get off the bike for <5 min., lay flat and then stretch the legs (knee to chest, cross-leg pull to chin, etc) then go. I'll snack and hydrate on the bike.