How long does it take to get to the station by subway? A: How long will it take to build the stadium? B: It will take about eighteen months. How long did it take you to knit this sweater?
Teacher: Did you finish the assignment I gave you last week? Student: Sure, no problem. Teacher: Really, you didn’t think it was difficult? Student: Actually it was pretty easy. Teacher: How long did it take you to finish the assignment? Student: It only took a day. My friend and I did it together so it was easier.