I do not stall rest horses that turn up lame and show a positive reaction to hoof testers. Neither do I soak or pack the hoof. I’ve observed that if a horse becomes increasing y lame as the days go by, I can plan on an abscess. If the lameness stays the same, or gradually decreases, I hope for a stone bruise. It also helps if you are watching a horse trotting, see it step on a rock, and go immediately lame.
The time frame in either case is whenever. I’ve had some abscesses become nerve wracking.