I found the first one I did of these to be SUPER time consuming and the app wasn't working. Also, the app does not go in the same order as your "book". You're supposed to pull up, get gas, walk in, do your MS section, check the bathroom, return to the vehicle, take a picture of your pump (never understood this part as ... there's no place to actually upload this picture except for the overall pumps photos and I always had different ones for that..?)
But the app did not work correctly for me. and I had to scroll back and forth.
I second the make a cheat sheet. Note how many pictures you need overall for each section. Make sure you get extras in case it isn't as good as you thought it would be, or in some cases, you forgot something. But yeah, the first one took forever. I'd do this one, and then when one becomes available again, I'd try a second one, because the second and third one, before I was even quick, were still way quicker than the first one. Given the two gallons of gas and the reimbursement, it was definitely worth it to do them -- after I got through the first nightmare where NOTHING went right. I was on site for the first one for like three hours. The cashiers were freaking out... I guess they thought I had found a bunch of really bad stuff.
I'd even print off a list of the food items, and then put a check mark through the ones they have. Maybe even for the lubes too.