Every 30 minutes from now

The only trigger I can find is to trigger at the top and bottom of the hour. is there a way to do it every X minutes from now so I am able to set it this up at the present time of 10:40 so that it would it will then trigger at 11:10 which is 30 minutes from now?

Maybe this?

This should work. Create the automation first then add its entity ID where shown.

triggers:
  - trigger: event
    event_type: automation_reloaded

  - trigger: state
    entity_id:
      - automation.[AUTOMATION_ENTITY_ID]
    attribute: last_triggered
    for:
      minutes: 30

If you don’t want the 30 minutes to start every time you reload automations, omit the first trigger and trigger it manually to start it off.