It is worth noting, that on the M96 motors, it's relatively simple to update the sleeves (LN), very easy to update the rods (R&R, Pauter, etc), pistons (JE), but not the crank. These motors unfortunately don't run a forged crank, and finding someone to make a forged crank for these motors would be cost prohibitive by itself.
As to how long it takes a turbo motor to blow up, a significant portion of that depends on how well it's tuned.
I will say, however, that I think a proper turbo kit, done within the realm of sanity, is possible on these cars, and that no one to date has done it right.
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Boxster S
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