I have had those occasional shops where it has taken three or four hours to finish the report. Mostly this happens when either my computer or the report site is acting up, slow or there were several mishaps in the visit. We all hate it when things do not go smoothly on a visit as that requires extra reporting time. But after all, isn't that why we have been hired? So once in a while there is a visit full of incorrect service/food. But I find, although it is annoying to do those reports, most of the visits do not require extra reporting.
For those full time shoppers who need the income and where time is money I can understand not wanting to do reports with no or little fee. And I can also understand those of you who can consistently find large bonuses on simple shops replacing an expense at a fancy restaurant with several smaller shops and paying out of pocket. I personally would have to spend a lot more than 2 hours shopping to be able to use shop money to pay for a fancy dinner.
So location, location, location is important in your decisions as is your financial status including your tax status and your level of enjoyment going out for a fancy meal at a fancy place. For me those $10 quick and easy jobs are not worth it as they take me over an hour each. Driving, parking, walking, waiting in lines all eat up a lot of time in my market.