How long do squirrel cage fans run?

So I'm gonna have to run my 95 cfm Hydrofarms full time it looks like.

What is the mechanical life of these things?

well i dont know the lifespan but i had mine running for a full year 24/7 before i had to move but plug the fan in a few days ago and worked great

yeah they will run for years, however they are a bit more noisy than inline ones but it should work just fine