These bikes hold very little oil so the oil wears out VERY quickly. The engines are also highly tuned which doesnt help matters.
The 600 mile recommendation is what you should do if riding the bike how it was meant to be which is fast trail and off road riding.
If you just touring, you should be ok for 1000 miles using high quality oil and having the motor is good order in the first place.
Any longer than this and your going to wear the engine out considerably faster than you should be.
How long is your trip and how old are the bikes ?
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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