A:I guess you should know that you need to be hospitalized . B: Of course I know . A: Now you can go to the in-patient department to go through the admission procedures . B: OK . I'll go right now . By the way , do you think I ' ll have to stay in the hospital for long ? A: It's hard to say . It depends on your recovery condition . But you need to stay for <MASK> for observation . B: Thank you , Doctor . I will go now . Bye-bye . A: Bye !
at least one day at least one second at least two years