Are you talking about a blue label G17 or a G17L? A blue label shouldn't take that long. Some models like the L, SF, and comp models are only ran a couple of times a year so it will all depend on production, the only way to tell for sure is to call Glock.
Next question would be if your dealer is just a FFL or are they a Glock dealer, if just an FFL, they will purchase and then ship the 17 from another dealer, so you could save some time and money by purchasing from a Glock dealer.
Next question would be if your dealer is just a FFL or are they a Glock dealer, if just an FFL, they will purchase and then ship the 17 from another dealer, so you could save some time and money by purchasing from a Glock dealer.