Five variables make the gap, and they do not weigh the same at all. In order: the duration and scope of the licence, whether a food stylist is on set, the number of output ratios required, whether the shoot happens during a live service or a running event, and only then the time on location.
The first crushes the others. The same photograph, on a restaurant website for two years in France, or in out-of-home plus DOOH for five years, is not the same price, and it is not a question of work delivered: it is a question of exposure granted. A client who understands that line understands the whole quote.
The second often surprises. A food stylist is not decorative overhead, it is what lets a dish hold for twenty minutes under built light without collapsing. Across a fifteen-dish menu, a stylist saves half a day, and costs less than the half day saved.