I find that cocaine isn't something you really "dose" out.
you kind of just do some. and then you just kind of do more when you feel the need. which will most likely be in 10-15 mins. if you've got good cocaine, about every half hour. although it tends to be shorter and shorter the more you get into it.
I hate cocaine, but I dont pass it up if offered. and I IV it, so I end up like a pin cushion. this is another drug that makes me feel dirty.