Scheduling Dashboard Subscriptions

We have an option to subscribe to dashboard via email.
I am keen on getting daily updates but i see the limitation in setting up the time of subscription in ui we can only schedule the time in hours

but there is no option to select the time in minutes, i want updates from multiple dashboards as there is no option to select the minutes every dashboard running at the start of the hour will choke my database, hence i want to add minutes to my mail subscription schedule.

If this is currently not available in ui can i update timestamp in DB where metabase stores all its metadata?