Yeah did you take the same type last time because if you took the cough gels this time and you usually take the syrup then it will take longer than normal. Also I've found with high doses it takes a little longer to kick in. My second time I took 24 pills waited an hour and dindn't feel anything so took 8 more and right afer I took them I started getting really fucked up. And about an hour later when the last pills kicked in I was tripping really hard.