On average you can assume your flag will last about 3 to 6 months.

The worst wear is tear. Flags normally have a tough life. Weather, UV and mostly wind have an impact on how long they last.
You have to realize that flags are inherently delicate so that they can flutter like they need to do.
Keeping them exposed to strong winds is guaranteed to hurt them. It is for this reason we recommend lowering the flag and wind speeds of 6Bft.
Keeping them in the mast during storms can reduce the lifespan of your flag to one single day in worst case scenarios.

The second wear is discoloration. This wear is strongly dependent on UV. Unless we have really good summers (read: high UV values) this is