How long should tips last on my plasma cutter? I've got a water separator coming out of the compressor, as well as one right on the plasma cutter and the small pigtail miller inline filter.

I doubt I use this machine as much as most here, but how long should my tips be lasting? Seems even with one cut, I can tell there is tip wear happening. If I let the tip go, and just cut anyway, the kerf is not pretty, but still works quite well for a long time.

Got a Miller 625 extreme with the xt40 cutter......... I cut on 220 using the 40 amp tips most of the time.