Many short trips adding up to a given mileage will put more wear on the engine than a single ride of the same distance. When sitting parked, some of the oil that normally coats parts will drain down under the influence of gravity, and for a brief moment when first starting a cold engine there will be a little more friction.
Also, repeated use of the starter will wear it out eventually; so the more starts in a given time the sooner it will wear out.
But do you want your Burgman to last forever? It's summer! They were meant to be ridden hard and put away wet! **** the consequences, full speed ahead!
In normal operating temps, I'd think anything over a mile or so one way would be fine. The potential fuel savings using your 400 cc scooter vs you 400 CID SUV (or whatever your cage is) will possibly offset the marginal extra wear and tear on the scooter. Plus you'd be saving miles on your car or truck.
Ride that sucker.
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