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@Dammit
The point at which it is recommended to rebuild an M96 engine is 100,000 miles - they can go far beyond that, but the risk of spinning a rod bearing increases dramatically (it's main bearing wear that is the primary reason for the rebuild interval).
Halving that sounds reasonable to me, given that it would take me 15 years to do that mileage I'm bound to rebuild the engine before then anyway.