Every two hours
0 */2 * * * runs at minute 0 of every other hour (00:00, 02:00, 04:00, …).
Offset
Start at 01:00 instead: 0 1-23/2 * * *.
Cron expression to run every 2 hours: 0 */2 * * *. Plain English and timezone-aware next runs.
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5-field: min hour dom month dow
Plain English
On the hour, every 2 hours, every day
0 */2 * * *0 */2 * * * runs at minute 0 of every other hour (00:00, 02:00, 04:00, …).
Start at 01:00 instead: 0 1-23/2 * * *.