$Game::MaxRespawnTime
$Game::MinRespawnTime
I'm not 100% sure what the difference is, but in my testing with Self Delete $Game::MinRespawnTime is the variable that's used.
After thinking about it for a second, the reason there's a range is probably to limit people from creating minigames with enormous or instantaneous respawn times. Outside of a minigame, most likely $Game::MinRespawnTime is always used.