In Germany and the Netherlands there is/was a "Morgen" which was the amount that can be ploughed with an ox in a morning. Set to about 60% of a tagwerk (day's work) which unsurprisingly comes out at about an acre. https://en.wikipedia.org/wiki/Morgen
According to that article, the size of a Morgen varied widely with place. It seems that in Mecklenberg they were particularly industrious and managed well over an acre just in the morning. And in Land of Hadeln they were pretty much superhuman, managing the best part of 3 acres in the morning. So provided that they didn't take the afternoon off they'd be going at coming on for 5 acres a day. Whereas in lazy Franconia their Morgen gave them only about three quarters of an acre per day.
Of course those of us without direct experience of ox ploughing speeds are left pretty much none the wiser.
Similar to 90-mile beach in NZ. European settlers reckoned they could do 30 miles in a day and it took them 3 days. It's actually more like 55 miles because the Europeans under-estimated how much the sand slows you down when you have horses and carts