It really depends on the rider. Motorcycle gloves are not like a tire that you can reliably ride on for 20K miles. Some riders change their gloves every year, while others clock 40K miles with a single pair of gloves, and they’re still going strong. Also, some gloves take more abuse than others (sport riders, company looking at you!).
As a general rule:
At the end of the day, only you can be the judge of whether your gloves hold up to your type of riding as expected.
Company routinely get letters from riders who have used the same pair of Olympia gloves for years without wearing them out. As they say, your mileage may vary!