Printing time varies widely between documents because of the type(s) of objects, images and/or effects in the document. For instance, your drop shadow alone could vary the printing time widely by the resolution of the image drop shadow and the amount of Gaussian Blur used. Transparency options under the Advanced options tab of the Print dialog will also affect the time involved in printing. Other options like, Entire Document, Complete Area and Smallest Area all take different amounts of time to print as well. Try changing these options to see the difference.