when you look at stats like "time of possession", they show you how long certain players are likely to be next to other players. Its generally around 20-40 minutes. I know guys move around on the field, get covered by other defenders, etc, that limits that time to some extent, but that may only INCREASE the likelihood of spread by putting players in close contact to more people even if for short times. Well to start with you can cut that in half because there aren't two-way players. But the whole thing about duration is that while it is possible for a single person to exhale once and that has droplets that end up infecting someone, it doesn't reach a reasonable standard of high risk for transmission. And again, these players are getting constantly tested which shrinks the risk further. I would say football and basketball are the most risky, but the exact degree of risk pales in comparison to risk of exposure off the field, to Judas' point. No, 20-40 minutes per game is the time an offense or defense is on the field meaning (barring substitutions) a player is likely to be in close contact with another player for that time period. And a player may slip past the testing protocol unless they are testing the morning of a game and have results immediately available. It could become too retroactive to be purposeful. I agree about the nba vs football, but I give nba fans more credit in terms of intelligence. maybe I'm wrong