Average life span of a MAG pump

[Biotech]

Came home tonight and found my MAG9.5-return-pump is dead. Luckily, the Gen-X that powers the closed-loop is functioning and all corals looked fine.
I had the MAG pump for a little bit over a year. I cleaned the pump every 4-5 months and there was no calcium build-up.
A question to all MAG users - how long do your MAG pump usually last?