Lung function takes over a year to recover to what it was before after anesthesitic
@mintybonbons suspect this was due to your lung surgery rather than the anaesthetic as this certainly isn't universal.
@Bubblemonkey recovery depends not just on the type of surgery but also how fit or not you were going into it (so if you were septic with multiorgan failure it would take many months longer than the same operation done in a fit patient on a planned basis), how many other health problems you had that could have been impacted and if you needed other treatments after.
The surgery you had is often (but not always) done for bladder cancer, so if you needed other treatments that might have made a difference to the length of your recovery.
If you didn't need other treatments, and it was a planned operation (which again it would most commonly be), and you don't have other significant health problems, I'd agree with you that after a year most would be back to normal. If you're concerned I'd ask for an appointment with your surgeon to discuss this.
I'm a surgeon, with a very small amount of experience in urology, admittedly many years ago...