it lasts a half hour or so....thing is with coke...you don't feel high...like you might with E ..or LSD....
Coke heightens your emotions...if your sad it could make you sadder..angrier if your already in a bad mood...for me being a fairly happy chap ...it just made me feel even better....it's like feeling invincible or you could do anything...
I've not done any for a long time but I'm not going to lie it was great fun...