A:Shall we go to the library by subway ? B: Yes , it's far quicker and less complicated . A: OK . There is no subway in my city . B: Really ? A: Yes . Does it operate night and day ? B: Yes , and <MASK> a week . A: Where do we pay the fare ? B: Follow me , please . A: Do I have to pay an additional fare to change trains ? B: No , you don't have to . A: OK , I see .
seven days one hour three days