In the general sense, the durability of a product means how long
it lasts, especially after use and damage. For example, if a camera
tends to break often, its durability is not very high. If a camera
doesn't break even after much wear and tear, its durability is
high.
In another sense, durability may refer to the market durability,
which would mean how long can a product last in the market against
its competitors.