Цитируется из статьи Microsoft Technet, Schtasks :
; To schedule a task that runs every 20 minutes
;
; The following command schedules a security script, Sec.vbs,
; to run every 20 minutes. The ; command uses the /sc parameter
; to specify a minute schedule and the /mo parameter to specify
; an interval of 20 minutes.
; Because the command does not include a starting date or time,
; the task starts 20 minutes after the command completes, and
; runs every 20 minutes thereafter whenever the system is running.
; Notice that the security script source file is located on a
; remote computer, but that the task is scheduled and executes
; on the local computer.
schtasks /create /sc minute /mo 20 /tn "Security Script" /tr \\central\data\scripts\sec.vbs
Вы можете найти больше объяснений и примеров в упомянутой выше ссылке.