The pre purchase survey is the most comprehensive type of inspection and is advised when purchasing a used or new vessel. What the surveyor does and how it is done has a lot to do with his or her observational skills, experience and professional method of work.
Once I receive an assignment I spend time researching various sources to determine the history of the boat model and any published potential problems with the model.
On the scheduled day of the inspection, I spend four to five hours (for a typical 30-40 ft. vessel) on the boat.
The following day I will spend four to five hours writing up the survey report. I strive to deliver the final report as a .pdf file within 48 hours of the completion of the field work. Insurance and lenders accept pre purchase surveys since they are the most comprehensive survey.