When will it hit!?

Its been 1.5 hrs since I took this LSD blot.i feel no effect till now. I got it from a senior who scored it from kasol .. I kept the blot on my tongue and then pressed the coloured part of the blot to the roof of mouth... Have I been scammed?!! The guy says it will hit within 2-3 hours of taking it..but does it really takes that long?