That's way too long. Ten minutes is more demand on my time than I really want to give to wrangling food items. I'll be in bed eating cake, thanks.
In any-event. It is objectively more expensive to buy junk food, that includes the cheaper junk. Once I cut out the trips to the takeaway and the deli, I was surprised at how much more money I had per month.
The fact is that people tend to want to eat junk.