The linked post is over two years old. The drawback of referring to techniques described in old posts is that they’re often superseded by more modern techniques and/or have been deprecated.
For example, if I wanted a Time Trigger with multiple times, it can be written like this:
trigger:
- platform: time
at:
- '00:00:00'
- '01:35:00'
- '03:15:00'
- '06:10:00'
However, your application requires triggering at regular intervals (every 2 hours) so that’s best served by what tom_I has recommended: Time Pattern Trigger.
BTW, there’s a mistake in your automation’s action. The “Grow Tent Fan Off” is effectively a separate automation but its faulty indentation makes it part of the previous automation’s action. That’s invalid and should be corrected.