I do agree with the original poster that some shops seem to linger. I just wait if I don't think the pay is enough.
However, I just finished shops in the last two weeks for $75 and $100. It took me about 70 minutes combined onsite and about 80 minutes combined travel time.. Reports were long an tedious. I don't know why you click on a yes answer and then have to restate the question in the affirmative as a remark. But that's what's required.
I did two at $150 each just yesterday. Same shop as the previous two. I had total travel time of two hours for the two shops. I added three other shops in the same city to make it a $387 route.
I've been paid for the first two. None of these shops required i spend any money and they were not upscale dining shops.