Every 15 Minutes Cron

Example:
*/15 * * * * /usr/local/bin/check-status.py
Use */15 * * * * for quarter-hour intervals. Runs at :00, :15, :30, and :45 of every hour.
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FAQs

How many times does */15 * * * * run per day?

96 times per day (4 times per hour × 24 hours).

What is the difference between */15 and 0,15,30,45?

They are functionally identical. */15 is shorthand notation for 0,15,30,45.