the simple answer is ... who knows??????
There are so many variables , paint type ambient air temp , temp of the model size of area being painted, etc etc etc...
the thing is there is no fooproof method to just get a single coat and keep the control for finer freehand.. the best freehand is multiple thin layers ..
depending on what you are painting it comes down to a choice between doing it the right way with thinned paints and taking your time or coming up with a quick way to save the time..In that case it is jst a matter of practising with the paints you have on a test mini until you get the cosistency you want.
best advice I can give that can help is when choosing a brush go for one with longer and fuller bristles but still a small point.. This will carry more paint and allow you to reduce time by lowering the number of pallette to mini transfers you need to do....