I completely understand your question and what you are asking, but really the answer can all just depend.
You should let a field rest until you think it will produce the results you are after.
If you are only wanting to hunt and get full limits, then it could be a while, or just wait until a lot of birds are back in it again. Sometimes it could be the very next day, sometimes it may not get hot again all season.
Some folks just enjoy being out hunting and aren't necessarily worried about full limits. Hunting more often but just scratching a couple birds here and there. In this case you don't have to wait nearly as long.
I let my fields rest a week in between hunts. If you aren't looking for limits like Featherdusterb said you can hunt them in the morning and let them rest that evening then go back the following morning or vise versa.