No amount. It can be postponed by game administration if the field is unsafe. Same deal with snow.
The Back Judge (deep buy behind defense) is who handles the 25 second clock. He will give the 5 second warning for delay, unless the field is utilizing a visual game clock.
If you remember back in the day when we played teams & coaches were only allowed from the 30 to 30. Around 03 I think, it was expanded to the 25s. Its a simple boundary to restrict teams from wondering down into areas that do not need any interference.
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