How long do a pair of orthotics last?
While a typical custom orthotic might last around 2-3 years on average, not every case is a typical one. Some people need theirs replaced every year, while others can get 5 years or more (occasionally much more) of use out of theirs.
How often do you need to replace insoles?
With normal use, you can expect your insoles to last about 6 months, but this varies depending on factors such as intensity of use (i.e., running vs. everyday activities) and foot structure. For serious runners, you may need new insoles every 3-4 months instead.