how long does it normally take until i have to replace my O-ring by YoYoJam yoyos?
playing maybe 1 hour a day or so
Somewhere between five and ten years would be a good rough estimate.
If not longer…
Keep in mind that if you’re having trouble with an O-Ring response, you can clean the O-Ring with a light soap and water mixture, or completely flip it over for a fresh side. Not to mention the O-Ring that fits in them are like 0.15 cents in the US. 
Though, most use flowable silicone.
silicone o-rings perhaps.