I’m not good with land; a third of an acre is a pretty good amount of land, right?
It depends, really, if you’re coming from the city or the country; to a New Yorker, a third of an acre is a really good sized lot, with room for the kids to play and a garden.
In the suburbs of Little Rock, where I grew up, a third of an acre was a corner lot (as opposed to a mid-block lot) for a big house.
If it helps to think about feet at all, it’s 75 by 200 feet.