There's a guy on this forum who took over 20 years!! He posted his story not too long ago.

It took me about 4 years. Longer for my first turkey....that took about 6 years. I owned a bow before I owned a shotgun. I hunted both game with bow only for the first three years. The 4th year I shot my first deer (a doe) with my bow. The following year I got a shotgun. Took me another year before I managed to get a turkey. I don't know what the heck I was doing wrong with turkeys but those buggers really gave me a hard time.

Like the others said: once the first one is under your belt, it seems to get a little easier. A lot like the first time you....well...you know! hehe!