How long you taper for usually depends on the distance of the race you’re targeting and what kind of mileage you’ve been logging from week to week in training. A typical taper for a marathon is two to three weeks, but some runners like American-record holder Deena Kastor only taper for 10 days beforehand.
Conversely, Hunt usually prescribes a three-week taper for her athletes. If you haven’t felt “fresh” at the starting line for recent races, look at the duration of your taper. Consider adding an extra week (or even a few days) of reduced volume and intensity to your schedule. On the other hand, if you’ve been prone to longer tapers and feel like you’re heading into your races too rested, shorten them up a bit.