Time period/ times used roughly?
As in how long have I used them? I got hooked on them when I lived in Singapore back in 2015... and started off with just making chips, then over time have tried other things (eg baking cookies, cooking marinated chicken, reheating KFC, etc).
The first one lasted until about early 2018 (with near daily usage) but due to lack of cleaning after we moved back to Sydney and didn't have a cleaner come to my apartment every week to clean stuff properly, it just got a bit gross and we realised it was nearly the same price to just buy a whole new air fryer (<$200) than to replace the basket/parts. The original one we had was the most basic model where the metal tray in the basket couldn't be removed and it was just a total pain to clean. I think we had also dented the handle attachment from dropping it a few times and was worried it wouldn't last much longer/was a bit unsafe to use.
Coming up to end 2020 and I think I may have let my 2nd one get to a state where even after I scrub and scrub, it still has a bit of residue and it might be time to replace again... or maybe I just need a really good scrub.