It took 5 months (3 cycles) to conceive DD. I was 26 at the time.
It took 6 months (6 cycles) to conceive DS. I was 28 at the time.
Note, however, that the first time around I had long, wacky cycles, but the second time around, I was cycling like clockwork, which I think is a result of my body getting a clue after having the first kid :)