I don't even know if this is arguable. Most service jobs likely could be trained within a week at most. The most complicated part generally involves learning how to operate a point of sale system. Most of them could be operated by anyone, which is why self checkouts are a thing now.
Farming on the other hand, especially modern farming, must take a lot longer to learn. There is a lot more to learn about your equipment alone, nevermind your crops, fertilizers, rotating fields, weather patterns, etc.
My point was that there was no choice but to break your back to pay the Dime tax to your local church, but ofc I couldn't farm a potato if my life depended on it.
Do you still miss the time where we were all farmers ?
Farming on the other hand, especially modern farming, must take a lot longer to learn. There is a lot more to learn about your equipment alone, nevermind your crops, fertilizers, rotating fields, weather patterns, etc.