If you're battery constrained and not expecting a signal most of the day I imagine you could put the radio to sleep for 5-30m. I kinda understand a weak signal

If you're battery constrained and not expecting a signal most of the day I imagine you could put the radio to sleep for 5-30m. I kinda understand a weak signal getting boosted and draining a battery, but when there's none at all? It just seems like a use case they didn't care enough to address. Since it sounds like this is the primary use case, I figured someone might have tried.