I'm on my third or fourth new chain at this point. I just swap it out at the annual tune-up and move on. Lasts about one year due to heavy usage and environmental factors.
I think the weather has an impact. here in the North East US, we get some cold, some snow, the roads get salted/sanded when it snows, and... the sea air also contains sea-salt and that sea-air can react with a metal bicycle chain. But that might be different where you all live. It just depends on your climate conditions
300th post here ....
