If the ceiling is 8' tall, you'll be venting 384 cubic feet. My marine engine bay exhaust fan runs at 170 cfm. My math says it'll take 2 minutes and 15 seconds to evacuate that space, theoretically. it's not going to be as simple as that because those fumes will linger and mix with any other open vented air entering the room. I'd connect a paint hood or as some call them a paint booth to the exhaust which will capture more of the fumes. In addition, you must wear a respirator. Those fumes will linger longer than 2 minutes and 15 seconds. I still get a slight whiff of paint odor from my enclosed booth which is 2x3x3 or 18 cubic feet after a few minutes of spraying.