One often wonders how long to wait after watering or rainfall. Of course an exact answer depends on
....(1) depth of planting and
....(2) time of year, where a seed or sprout might require daily attention in midsummer whereas a medium-size tree after several inches of rain might survive weeks before browning begins to set in; as well as
....(3) type of dirt, as we suppose loose topsoil for instance would dry out more quickly
Such considerations might require extensive treatment yet could be open to some general guidelines, eg:
.........(a) Might a seed or sprout in typical garden soil require watering twice a day in hot June whereas
........(b) After a shower Might a 15-ft tree not require watering for weeks. For instance in cold December, say, one day for each 0.1 in. of rain
We can wonder about indoor plantings as well:
For instance assume a gallon pot with sprouting seeds. How long after saturation does the surface it dry out endangering the planting
Of course the answer depends largely on the kind of soil and the ambient temp. One might suppose for instance that packed soil would hold water longer than loose compost or longer in winter than midsummer. But surely there must be some rough guidelines