Can't get my automation to trigger every 2 hours

Turns on for an hour, then turns off for an hour. Repeat, ad infinitum.

alias: Pet fountain
description: ''
trigger:
  - platform: time_pattern
    hours: '/1'
condition: []
action:
  - service: switch.toggle
    target:
      entity_id: switch.plants_humidifier_2
mode: single
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