*/5 * * * * /path/to/script.sh
*/5 * * * * to run tasks every 5 minutes. This runs at :00, :05, :10, :15, :20, :25, :30, :35, :40, :45, :50, and :55 of every hour.The */5 notation means "every 5 units" in that field. In the minutes field, it runs every 5 minutes.
It runs 288 times per day (12 times per hour × 24 hours).