Until I finally get it all mulched and planted, I have 2+ acres of weedy grasses that have to be mowed, constantly it seems. I have it down to about 4 big patches my wife can do with a gas riding mower from last century, while I get the edges of the property, and around the house with a gas self propelled walk behind and a string trimmer.
It's been 2 years and so far I have converted about a 1/4 to 1/2 an acre into a potager garden and food forest. If deer weren't so plentiful, I'd probably be farther along.