Originally Posted by Cougar
...I feel blessed) but a general rule of thumb for when I was working with a clients horse was if they pulled up lame, once they were back to usual on their own free turnout I'll do ground work for a few days, then get back on and do light riding for a week. Obviously it's not set in stone as they are all different. But if they're feeling fresh no harm in putting her on a lunge and seeing how they're moving.
We've never had a horse lame for 3 weeks...only the occasional sprained ankle, but we've always given them 5-7 days off after they're walking fine before starting to work them just to be sure they don't re-injure it. As Cougar said, after that you just have to play it by ear to see how fast they come back.