An accurate estimate isn't really possible with the food delivery business model. Couriers will have 2-3 orders, so if you are order 1 or two, there is a new variable that enters the equation after you purchase the food. They obviously add other items on a similar route, but wait times and such are fairly random). Of course they could do 1 order to 1 driver but that would double the labor costs (sequential orders would be 2-3 deliveries per hour max per courier, vs 4ish when optimized).