Up to 1.5-2 weeks. Skin test takes 3 days. If it's positive you have to do x-ray (which is couple more days). And if the doctor (office) is slow it'll take couple days to finish everything. Also if you want to do the blood test (to avoid shots and that's what I did), it's also 3-5 days I believe. So best case scenario - 3-4 days, worst one - 1.5 weeks or so.