We went back to school during holidays to print our boxes. After carefully rechecking the dimensions, and changing the thickness of the boxes, we launched 3D printing. We had smaller and larger boxes. 
Printing a small box took at least 4 hours (because we added layers of thickness)
Printing a large box took at least 8 hours.
The lids of the small and large boxes took 30 minutes and 1 hour respectively.
Of course, these values are approximate...