I think it depends on the location and time. Ordered at Ronto's Roaster around 10:45, window to return started at 10:55, but I guess at some point before that I was able to choose I was there, bec next picture on phone is that order was ready at 10:52. same experience at Satuli canteen, ordered at 10:20, return started at 10:30, I then have a picture of my food (yes, we do that,) at 10:42, so not all that long
However....my experience at Backlot Express was the complete opposite, and all I was getting was the stupid Halloween treat/drink...placed the order, and the return window was not for another 30-40 mins, then when I hit that I was there, it took another 15-20 mins to get the order......
So, I would suggest doing what we usually do and eat early, and not order/eat during peak lunchtime, like I did with backlot express. There were a LOT of people milling around waiting, and it was recommended we go wait in the Indy show area. Hubby had ordered food at PizzaRizzo just a little before us, and didn't wait nearly as long.