Here are some more examples
Run every 6 hours at 46 mins past the hour:
46 */6 * * *
Run at 2:10 am:
10 2 * * *
Run at 3:15 am:
15 3 * * *
Run at 4:20 am:
20 4 * * *
Run at 5:31 am:
31 5 * * *
Run at 5:31 pm:
31 17 * * *