Relative to natural ability and a number of other things, I think this is too subjective an issue to have a poll attached to it.
However, if by getting it you mean figuring out your discs, then the answer is "20-30 throws into the life of the disc." Or, in the case of my Blizzard Dominator, the moment it touched my hands. But honestly, the thing that made the most difference was field work and understanding my capabilities. You've gotta play within yourself. Are you consistantly turning over your driver and wasting strokes in the woods? When you do clip a tree and get sent into the rough/woods, are you being smart about it? Or are you trying to take a line with 98% margin for error? Take bogies when you have to. Don't play the hero.
But ultimately, be confident. Throw discs that make you believe in yourself. My goal, every day, is to not shoot bogies. Put myself in a position to play well and consistant. If I don't think I can make a drive into a small opening, I put it in front of it to give myself a nice upshot.
Ultimately, though, I was given the best advice by a friend of mine. It's about confidence. Not every one is going to be able to throw bombs. But really, you don't need to. Refine the fairway and green aspects of your game. And make sure you have fun. And get a putter that makes you feel like you can't miss.
But stop worrying so much about "getting it" and start dialing in each disc. And if you have a disc that after 40 or 50 throws, you just can't do anything with that makes sense, SELL IT.