How long does a USPS parcel post take from California to Massachusetts?
I would say from 5-10 days even longer during holiday/back to school season.
Old (optimistic) answer: USPS Parcel post typically takes 2 to 9 days for delivery depending on the orgin to the destination. Truthful answer: Parcel Post shipping between any two points in the United States, even when separated by only a few miles, can take up to several weeks. Use of a genuine shipping company is recommended to those who wish to have parcels delivered with any degree of predictability.