If it's a car with similar ergonomics, then imediately or just a few minutes. I'm a tall guy that likes sports cars, if I can fit in them. I'm also comfortable with most Japanese ergonomics and mechanical design. I've never really been comfortable in an American car and I owned a TransAm. The cars are in theory, bigger and more roomy but nothing hits my in the right spot, and the controls are placed wrong. Also the US doesn't do two door hatchbacks, my preference (Nissan Z, CRX, RX7, Supra, etc) I can't fit in most Italian cars (leg room) but there's plenty of room in German cars. British cars are hit and miss, weirdest was driving a friend's right hand drive Mini Cooper around the block, (I can't imagine driving it safely on the left side in busy British traffic.)