The aquavit that I started however many weeks ago is finally ready, and a bit early. It's difficult to let the process go too long, but after the first month, there are no more great leaps in flavor to be made. The trick to knowing when the liquor is done is to taste it, and to look at the fruit.
First of all, it should taste pretty good. If it doesn't, you can chug it with cinnamon gum and still get a good buzz. Second, the fruit should look like it's seen a ghost. This is due to diffusion, as molecules of a greater concentration move to an area of lesser concentration. This also means that the fruit is tasteless, as its soul essentially jumped ship to drown in the liquor. Same thing happens whenever making stock, so just filter the aquavit and discard anything that gets caught.