I tried searching to find out but nothing... I have not used anything at all in 11 days but I was sick for nine of those-- like exorcising demons, worst withdrawal of my life for four. Anyway, I am not planning on just going back and using but the people I would normally ask I shouldn't. I know if I was to use I'll WANT to do it again but I mean physical dependence. I have had that go away but I was clean for years, so I have nothing to relate here. And this bout of withdrawal was the result of a slip up after going through 4 days of bad withdrawal-- so definitely not that soon. I mean, is it 28 days? Is that why they always want people in rehab that long? Never been to rehab/ detox. Thanks.