1) How long have you been collecting them?
你集邮多久了?
2) How long have you known her?
你认识她多久了？
3) And you've been In here how long?
你在这边多久了？
4) How long do you stay?
你逗留了多久？
5) How long have you been studying English?
你学英文多久了?
6) How long have you be learning music ?
你学音乐多久了?
参考词条