I work in a trans shop, and the fluid is murder on hoses, so we would be really lucky to get 2 years out of any hose.
Mostly they get really stiff and discolored.
We use legacy hose, the bright yellowish green stuff. Its nice and flexible and light.
I have a friend who uses it in a small shop at his home where he works daily and he may get a couple of years of so out of a hose. He has a friend who comes by and putters around while he works, and the friend occasionally will wash down the hose and make it look all nice.
It does not like heat though, a welding spark will put a hole in it instantly. I have even seen a cigarette but roll across the floor and up against one and it instantly popped a hole in it.
The old heavy red hoses last a little longer but are a much bigger pain to use on a constant basis so I haven't bought any for years. In a trans shop it starts to feel like a piece of pvc pipe in about 6 months.
Air hose is pretty much a consumable. Expect to have to replace it every so often. For $20 you can get a cheap heavy pain to use hose, or for $40 ish you can get a nice light hose - if you aren't a welder anyway that is. Prices are approximate for a 50 footer.
Legacy hose has come down a lot, used to be about twice that for 50'.
I have a couple of Harbor freight copies of legacy hose out on the floor for the mechanics, it seems to hold up just about as well as the actual legacy. Those have been around a couple years or so, but have been shortened and new ends and what have you, need to get a couple more new ones really.