No idea yet; I ran an AutoRx clean and then a rinse cycle on conventional oil, very short, and am only now 2500 miles into an interval with Pennzoil Platinum, so I haven't even approached the OLM limits yet. Right now, after 3 months, the OLM is saying 66% oil life is left.
At this rate, I'll still have 33% left after 6 months and ~5400 miles.