Maybe I just work quickly, or have a knack for it from doing it so many years, but most tractors I fully service in an hour or so. Just did Dad's new 5045E Deere (first 100hr service), changed engine oil/filter, hydraulic oil filter, topped off hyd fluid, checked coolant, greased all the fittings on the tractor, greased all the fittings on the loader, checked the front axle oil and front plantaries oil. Including cleanup it took me an hour.
About the same time for my B3200 or our M9540. They all require roughly the same service.
What does take me longer is my Ford NAA. While it is much simpler, there is also a lot more to check/adjust, etc if you do it all. Oil bath air filter to clean, dry brakes to adjust, points to clean and set, 3 trans/hyd sumps, etc