I'm still new at homebrewing, but I brewed the Brewer's Best IPA kit for my first batch. I can tell you from experience that the longer you let this sit, the better it will be.
I bottled my beer after 9 days, and I started drinking it around 7 days after bottling. It had a very bitter taste when it hit the tongue and a strange aftertaste which I can't explain. Like any first time brewer, I drank the heck out of it anyway.
I now have about 12 bottles left, and the taste today (after about 6-7 weeks) is so much better than when I had my first few bottles. It really tastes like a decent IPA that I would order in a bar.