There are big hobbies and small hobbies. You would have to know whether he was rich simply from farming and then took on RE as a hobby or something else.
Did he inherit a large farming enterprise? Did he leverage inherited wealth into more land? In my experience, real farmers don't have the time for travel and beach houses. I have family with very successful operations, but you would never know it. When they are away from the ranch, it is to haul something somewhere or for family events. They look like every other farmer trying to scratch out a living. For them, a side hustle is helping the neighbors with branding or harvesting crops around the area. They own thousands of acres of ranch land and thousands of head of cattle. They don't sell land, they buy it and put it into production.
The way you described it, your friend is there for planting and harvest. That reads absentee farmer to me. That means someone else is farming his land and he comes by to help out twice a year. Of course, I would need a lot more info to know anything for certain. Bill Gates and Kevin Costner probably think they are successful farmers, too.