Regular mode, the default mode, is ideal for lead nurturing, free trial follow-ups, event follow-up and similar processes where you wish to send out communications or evaluate contacts over the course of a period of time. Regular mode programs process program members at 15-minute increments. In case you are new to Program Builder, this means that every 15 minutes, program members will move from one step to the following step in the program (assuming they are not waiting in a step due to a time-based rule).
If you find that program members are taking longer than you would like to progress through to the end of your program, you may want to consider doing your marketing automation in Batch mode. Batch mode is often suitable for lengthy or complex workflows and for bulk data processing such as data normalization. In this mode, members are fully processed from the start of a program through to the end of the program every two hours.
I must add a disclaimer regarding Batch mode. When running in Batch mode, marketing automation programs do not maintain the detailed step-by-step history that can be useful when initially building and testing programs, so I recommend that you enable Batch mode once you are satisfied with your program’s configuration.