I like to leave a small radio in the engine compartment with the classical music station on. I find it keeps the engine much more inclined to start after sitting for months and months....
My goal is to only start the engine if I know Ill be able to get it under load and up to temp for at least 15 minutes. Of course, that doesnt always happen, but Im totally fine letting my girl sit for months and months. My ideal scenario would be to only start the bus if Im going on a trip of 10 miles or more. Ive seen 2 buses whos engines need new rings directly as a result of extended over idling and all the damage was done in a matter of 4 weeks while the buses were being rented to a tour company. They idled the buses to keep the heaters on for about 2 hours per day which means the engines sat there running with coolant temps around 120. They came back burning oil like crazy belching blue smoke. Two strokes are even more sensitive.
If ya got nowhere to go, id let it sit.
Patina enthusiast and professional busman