I started at 40mg and it took me 2 weeks to get my stools back. Some people response very quickly, some respond slowly, and some jsut don't respond.
Sometimes the dose makes a difference. 60mg used to be the "old train of thought" now they say 40mg is sufficient. Also remember that steriods can interfere with healing...especially blood clotting. I noticed it took longer for outside wounds, cuts, scrapes, burns to heal while on Pred.
Are you taking anything else along with it? Some suppliments / hebal remedies can also prevent blood clotting or interfer with the medicine being absorbed. A good website to check this out is http://www.umm.edu/altmed/