Trigger Action - Be able to set the occurring time to 30 minutes

We have our door code going out in an email to the guests at 2pm because the guests check in time is at 3pm. We are looking to make it at 2:30pm but we see that isn’t an option because they are set for every hour. We think that having it 30 minutes prior to their arrival would be a better feature. Even if there was a way to customize making it a time you preferred to have for the guests.

15 minutes would be better. 

[Another topic was closed as a duplicate of this topic (Delaying triggers by minutes or hours)]