Pai Dui Vs Pai Du

Had a little conversation with a friend.

Me : Wah , You know the donuts you eat, you need to pai du for days

Friend : No . Only One and A Half Hour

Me : Duh ?? So fast meh.

Friend : Yup . Pai Dui Only Nia.

Oh. My friend meant pai dui (queue) and I mean pai du(detox)

What a joke. :{