Four-and-a-half, but we were building awfully complex 3D game development technology without almost no funding (first revenue after four years, but founders cou

Four-and-a-half, but we were building awfully complex 3D game development technology without almost no funding (first revenue after four years, but founders couldn't take a wage for another half year). Doing incredibly well now, with 40 employees and growing (still no funding, but making one's own cash is much cooler :) d.