If you can find the post where someone mentions ProblemSolver's Zone records disappearing (might be in the Zone thread somewhere), and then check how long PS's not been online for, then that would give you some idea. But someone else is bound to know better. I think it's definitely more than 3 months - possibly getting on for 5 or 6 months. Luxoflux logged onto his second account (which he had because his original one was one of those that got blocked that time) and said his records had vanished, but that they came back once he did a race on the track, I think. Maybe send him a PSN message to ask?