User blog comment:V3hemenc3/What is the accepted number of farm on an AD carry?/@comment-5481392-20120918235110

What I've heard from a lot of the streamers/commentators that I watch is that by about 17-20 minutes you should be able to afford IE. Whether thats from kills or cs is irrelevant. At around 30 minutes you should have ie-pd and boots plus maybe a vamp sceptor or some other minor items (dorans, pots you've been chugging) and not long after that lastwisper/bloodthirster/defensive item as necessary. Gold, and therefore items, will come much faster after you have IE because at that point in the game kills are more frequent, objectives are being taken, and you can last hit much easier.

I'd say a typical game for me is probably 150-180-ish minions by 20 min and well over 200 by endgame, depending on the length of the game and how much fighting is going on.