curing times will depend where you live - climate and what type of paint you choose to spray. Steer away from acrylics take too long to cure.
Sand off the stain first and sand to about 240 or 320 grit - I assume you would have already sanded to about that level.
Make a timbermate slurry and wipe/scape it over the entire body, let dry at least 12 hours.
Sand that off and you should be ok for primer coats.