But I had that shit down to a science. After 6 or 7 hours of coke you ain't got any serotonin left in the bank. Not getting high anymore...just getting more and more sketched out. That's why I switch to dopamine. The opiates will keep you going for another 6 or 7 hours. A lot of people overlook that opiates are actually stimulating in reasonable doses. You only nod off if you take too much.