It depends,if a boater says they have a problem & need to run their engine for a bit-fine if they say it'll be an hour for example.If a boat has sat in front of you all day with the boater aboard who then starts their engine at 8.55 pm(happened to us recently),then I would not be a happy bunny.He said he hadn't checked his batteries & now wanted his tv on.We & the boat the other side of him basically said tough.We'd run our engines to top up our batteries earlier in the day,just as he could have done.No doubt some will say we're miserable gits,but part of boating is knowing we can have some peaceful relaxing time.
*He did turn his engine off.