I have done different audits for them. Generally the time is not nearly as long as they listed. I did sign up for a retail pricing audit with them and then when I read the instructions, I was like no way. It would have taken me like 3 hours and it only paid $25.
I find that I can do the audits usually in less time than they suggest. What is frustrating to me is that the first audit takes the longest and then I am on a roll. However they have limited me to 4 audits so I rarely get the mojo going to make some decent $$$. I would think that they would want mystery shoppers to know what they are looking for and to let you schedule more than 3 or 4.