A horse could walk almost a mile an hour faster than an ox, bringing the total time to plow 40 acres down to about 16 ten hour days.
A modern tractor with a 5-bottom, 16-inch plow could easily knock off the entire field in a day.
Each one can cover roughly 60 acres or about 24 hectares per day without running a second shift. In fact in much of the US, plowing is a thing of the past.
Most Midwest farmers primarily use minimum till, strip till or no till instead to reduce both tillage costs and soil erosion.
Google says it's roughly 60 acres a day, and poking around shows 'it depends' on lots, and that many crops are grown without plowing any more, using 'no till' techniques that don't disturb the soil as much.
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