Hi @Jamie_Hook,
Here is an example of how this workflow might be configured at its most basic:
From this workflow, you will notice I have a Data Table that contains two important columns: userId and time. The userId value would correlate to the user that has set this time value as a schedule. I use the Table: Get Rows Node to query the table for any rows that may match.
I currently have this workflow configured with a Virtual Button Trigger to manually trigger this action flow. If you would like to automate this workflow further, you could utilize the Timer Trigger. This will allow you to fire the workflow (and thus query the Data Table) at your own configured intervals. However, keep in mind that each trigger of this node, as well as the Virtual Button, does count toward your payload limit.
Please let me know if you have any additional questions on this!
Thanks so much,
Julia