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Letting it heat up and run at a decent operating temperature once a week or so will help prolong its life IMHO. Running an engine for only short periods of time is as bad or worse than not running it at all.
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Also, the ideal RPM will be at about 80% of the max RPM. 1800 - 2000 is probably under revving for a 3 cyl. Yanmar. You'll want to check the max RPM for your motor, but I would guess 2400 - 2500 would be about your target cruising RPM.