Most often (in my experience), it's not the engine, but the frame, suspension etc. that falls apart on an overland touring bike. People tend to overload the machines, they get dropped, vibration, corrugated roads etc. I've seen 'new' Triumph Tigers XC's with cracked subframes after less than a year and 40k. And depending on the make, they all have different soft spots and issues. (e.g. KTM 690 use the fuel tank as a stressed member in the rear; Older Honda trailbikes have a tendency to bend their sub's; etc.)
BUT
Assuming they were looked after properly:
60k for a low-stressed engine like XT600, XR650L, DR650 are low. 60k for a high-stressed engine like a KTM LC4 is a lot.
And listen to the top gear- spending lots of kms in top gear with a heavily loaded scoot tends to wear out the top-gear. My XT600 hummed like a truck gearbox after 60k.
My XT600 needed it's 1st engine rebuild at 90k, but that was because I allowed it to overheat.
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Squily
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