This feature is useful for menus which require different meal duration from that of your normal shop setting.

For instance:
If your shop is usually serving alacarte, 1.5 hours for meal duration should be sufficient.
Customers opting for a buffet promotion however, will require a longer meal duration.

Setting Up 

1. Proceed to the settings page by clicking the "setup" wheel icon  → Menu

     2. Click on the pencil icon of the menu you would like to edit.

      3. Move to the "Reservation Rule" tab, and select the drop down list from "Duration"
          in the first field. Once selected, click on the "Update Menu Item" button on the
          bottom right corner to save.