With not much riding it won’t get very dirty but might get moisture in it.
I wouldn’t even think twice about it . Start the bike every week and let it idle for 5 min and shut it down . Don’t just let it sit !!!
I respectfully disagree and have first hand knowledge from experienced ducati techs and have seen bikes that have just sat and have seen the issues first hand . They always have more issues . That’s why you let it idle for 5 min to allow them to get up to temp . You don’t want to just let them sit . Bad for all the engine seals and almost every other rubber part on the bike .
So basically there is no rubber seal and there is a metal seal which I was thinking to be the washer. Cool.I'd be surprised if being "slightly" over would do any harm, but double check that your verucal when reading just in case.
The sumo plug does have sealant applied according to the manual. I apply it to the thread, but should be thin once threaded inView attachment 42685