I do know that like a spring (for obvious reasons) most (like 95%) of the memory happens instantly. However, you get things like work hardening and stuff where there is a tiny bit of plastic displacement that the SECOND time around is elastic. But this is at the very very high end of the stress/strain curve. I am NOT certain at all but it MAY be possible that when we shave off a freshly honed edge we are pushing the newly honed steel to the tip of the elastic region on the s/s curve and work hardening it. I doubt this though, and if we were I doubt it would help to rest it. I also doubt we as humans have the sensory capability to notice (we're talking minute percentages of an already microscopic scale). IMO, it feels better if I don't use the same razor two days in a row, but I'm not gonna guess THE reason. Could be a few things, including a placebo. I'm just leaving it at that.