cat converter life span

I have a 98 740iL with 105K. Anyone have idea of life expectations for the converters?

i heard 80k-100k they cost alot a cheaper way is aftermarket i just had mine replaced today i used magnaflow universal 94004 it 2" od magnaflow told me this is what works on my 95 740il but 94006 is 2.5" and is said to weld better they are very cheap compared to other aftermarket cats but the others are fitted in easily

I have 140,000 on the Cats on my 1988 750 and they are still working just fine.