Life expectancy of fan with magnetic bearing?

I asked this on Superuser a while ago, but since fans are often used for cooling electronic devices, I think that the question would be on-topic here too.

So how long is life expectancy of fan with magnetic bearing? I did some looking on catalogs of popular stores and datasheets of some manufacturers, but I couldn't find any information about life expectancy.

Answer

Here's some examples:

In comparison to these non-magnetic bearing statistics:

Looks like traditional bearing MTTF wins! My point is that at the moment this technology is marketing fluff, regardless of its merits. Real MTTF numbers will tell the story... not that these are real numbers: take them with a grain of salt, as they are subject to lawyer jibbajabba and marketing hype. ^{(And no, that doesn't mean manufacturers have to wait 70'000h+ to characterize MTTF -- it is characterized much earlier using techniques to speed up the working hours.)}