How tiring was/is it generally to play in different situations (PP, ES, SH), for defencemen and forwards? We all know that Total TOI = PPTOI + ESTOI + SHTOI. But how does the distribution of ice time in different situations (PP, ES, SH) affect the overall ice time? Are some situations more tiring than other? Does for example playing 2 extra mins of PK make the player so tired he has to play 3 minutes less at ES/PP to make up for it? Or will it just be playing, resting, playing, resting, and so on... where it doesn't really matter if the player played PK, ES or PP? (Can one generally expect that a player who can play say 4+16+0 (PP+ES+SH) minutes, also could have played 0+16+4 minutes, or perhaps 1+18+1 minutes? Is tiredness a factor that should be considered?) I'm mostly interested in the last decades, and not as much regarding pre WW2.