depends on the parcel
If its full of drugs, quite a while.
can be a week, and they will write to you if they feel you have to pay extra.
Ive just had a small parcel from the US.
Posted on the friday afternoon, landed in the UK on Tuesday. Then took 2 weeks for parcelfarce to right to me, although the letter took a week to get to me too
Parcel delivered 3 1/2 weeks after posting, got clobbered for duty which I expected, but on the box was Parcelfarce 48 hour delivery, tossers