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Too long is relative, and it is hard to say
The night before would be fine as morning dew would allow the odor coming out of the ground to mingle in the grasses. If it did rain, that’s okay!- Odor will be more widely dispersed in that instance, as there is more wet. Overnight when it is dry (with dew in am) is preferable actually to planting in morning then trying to find later in the day when dry and thermals have come into play.
General rule: odor clings to wet things. The more that is wet, the more it clings to.