I use this almost daily. (unless i left my strap or something in the car overnight). I test 1st thing in the morning.
Easy aerobic workouts, though hard at the time, you deff recover quickly from. Really Easy aerobic workouts that take a long period of time, i find i personally recover VERY quickly from. Completely rested by the next day.
A hard speed workout or even weights workout and ill need the next day off, followed by aerobic the next day or even Two before i get a rested Heart rate again. That could be up to 3-4days before “I’m” ready to go Hard again.
However - as im personally not training for sprints anymore, i can do INtensive Tempo workouts ONE day, easy aerobic workout the next and then be recovered.
High speed workouts Smash me for days. But im also age 34…
Would have been interesting 15yrs ago to have HRv testing equipment. Does wonders for planning.