A few thoughts here. Firstly, everyones tolerance and reaction to cocaine is different, so where 1 gram might be plenty for some people with two grams deadly, for others, slamming a half ounce over three days is no big deal (well, at least not until day four, but that's a different story).
I think the issue here is that the OP is planning a "binge" his first time using coke. Because tolerance, and addiction potential increases dramatically as the duration of a session increases, it's just a bad idea to plan a binge the first time out.
Why not share a few grams with a few close friends on a night out and see how that works for you. Don't plan to use so much, however much that may be, that the majic is gone and you need to keep redosing in higher and higher amounts to get any effect whatsoever.
Used moderately for a few hours of fun with reasonable breaks in between, coke can be one hell of a social party drug. Trying to find a vein in day 3 of an IV coke binge so you can push off a 1/4 g. shot when you are shaking hard and can barely see your arm, much less find a vein isn't all it's cracked up to be . . .
FC