Allow at least a couple of hours to read and re-read the instructions and locate all the parts (small pieces were in individually numbered boxes). The instructions we got were barely legible (very light) so I ran them to PhotoShop to enhance. It took my contractor about a day and a half to install properly but he had made sure all the walls were plumb and square and had installed blocking in all the proper places. All in all, the result was fantastic, the door glides effortlessly and the glass just needs to be squeegeed after showering.