The selection occurs daily and starts every 10 seconds. Although keep in mind that if your work takes longer than the start time, the agent will not call it again until the task is completed.
See comments below. The user interface tool does not allow input for less than 10 seconds. In your case, you can schedule two tasks to complete for a certain number of seconds. The problem then is that jobs can overlap because they are different tasks, as far as SQL Agent knows.

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