As mine are used for gaming and need to be speed painted, I use the time honored length of arboreal material (otherwise known to the technically minded as a 'stick')
A number of figures, anywhere from 8 to 24 - are attached to the aforementioned Stick using a weak general purpose glue, then they are all primed as a batch with a rattle can from the local hardware store. Then paint one color on each figure e.g. all the coats, and by the time you get to the end of the row, it should be dry enough to start on the next color for the pants, hats or footwear etc. Rinse and repeat.