I have a similar John Deere with a pressure fed engine. I change the oil once every two years and do the filter at the same time.
However, it's now staying so clean (WIX filter) and a history of annual changes (in the past), that I'm going to leave the filter on longer - every other time, becasue it's inverted and makes such a mess to change ... So for me, that will be every 4 years.
I have run the same oil and filters on seldom used trucks for up to five years at a time w/o incident. Those trucks got more hours than your tractor per year.
It's a smaller engine with a smaller sump, but it may not be consuming much oil, even over the course of the year ... So, if your consumption is low, and your oils stays clean (looking), there is no anti-freeze to worry about, so changing is not a big deal. No temp control other than air flow, so it burns off all the blow-by fuel load when it's hot which happens fairly quickly.