How long does a washable AC filter last?

In my previous article of the best Washable AC Filters, I broke down the top filters available from amazon and their warranty. 

Best Washable AC FiltersAirthreadsAqua-FlowCarterK&N
MERV RatingMERV 8MERV 6MERV 8MERV 11
Average Price$23 - $60$11 - $180$50 - $60$23 - $50
Machine Washable?YesNoNoNo
Size Options17Infinite2615
Warranty1 YearNoneLifetimeLifetime
Number of Filters this Replaces36UnknownLifetimeLifetime
Is Electrostatic?NoNoYesNo
Is HEPA?NoNoNoNo

Search All Washable AC Filters Here