At an average, I play 2-3 hours a day (sometimes more or less), 5-6 days a week (Sometimes more or less), longest has last me about a year (MW Supertip). But then only been playing pool for a touch over two years, I am sure a tip could last as long as you're comfortable with it. My snooker cue has had the same tip for coming on four years now (but then my time spent at the big green table is a lot less than it was before I started to play pool - I play snooker maybe once a week if I had to average these days)
I have a Thoroughbred M on my Zen xPro that has a lot of life left in it, it's been there for half a year, and it still plays lovely. This Hayakawa shaft I am currently playing with has a Sakura M on it, and I am currently "umming and ahhing" about putting a Thoroughbred on that too. Waiting for the Sakura to hopefully harden a little bit. It's taken two shapings so far, and seems a little more frail than the Thoroughbred M. The feel is quite nice though. Haven't played a lot with this shaft, as it is still in the trial phase of being my main player. Can't fault the feel of this Sakura tip, hoping it becomes a bit more robust.