By comparison, the off-season for the four major US sports (excluding camp periods, etc.)
How about VALORANT, which is enough to hold the championships in December and the new season starts in February of the following year? The level of physical fatigue is not comparable to these.
NBA: 5 months max.
October: Start of regular season (82 games)
April: Regular season ends
June: Playoff ends
MLB: 5 months max.
March: Start of regular season (160 games)
September: Regular season ends
November: Playoff ends
NHL: 5 months max.
October: Start of regular season (82 games)
April: Regular season ends
June: Playoff ends
NFL: Maximum 7 months
September: Start of regular season (17 games)
January: Regular season ends
February: Playoff ends