Excuse me , could you tell me which line I ’ m supposed to stand in to buy bubble wrap and to post a package ?   You can buy the bubble wrap here , but you ’ ll have to stand in line over here to post your package .   That ’ s a really long line . How long do you think it ’ ll take to get through all those people ?   It takes about 3 minutes per person , so it ’ ll probably be about an hour ’ s wait .   Can I buy stamps here ? 