How long are most people normally getting out of the bushings/control arms running a normal 4-link setup?

If I would have noticed the bushing had pushed out of the sleeve sooner, I think my control arm would still be OK to use. With the amount of metal that got removed though, I didn't really think it was a good idea to try to re-use it.

The bushings are $40/set and I'm only replacing one side since the other is still good. Only took about an hour or so to get the control arm and old bushing out and the new bushing pressed in using the Maximum Motorsports removal/installation tool. I didn't have to take anything else loose from the suspension either, so while it's not something I just want to have to do every year, it's not a complete pain in the ass to get it done. I just need to be more vigilant in the future and check the bushings after every weekend and hope I don't destroy a control arm if this happens again.