Spotnnotfarm,
The shops vary in time so it is hard to say more than the shops and reports are very detailed. The best answer I can give you is to read your instructions and guides because this company does a great job helping their shoppers with their materials. If they say the report will take 2-3 hours, it will take that for most people. You can use the sample report as a guide. I suggest you create a plan of action for the day of your shop to cover all the required observations.
Most of all, have fun with it.
Happily shopping Rhode Island and nearby Massachusetts and Connecticut