At the moment that is not possible. Rainlendar hasn't been designed so that an event could be shown multiple times on the same day.
Unlikely since it requires a lot of changes how the events and tasks are handled internally. As a workaround you can create multiple events.
What about my suggestion (Recurrence every XX HOURs/MINUTEs)?
Current version now is 2.9, but this "feature" hasn't been added yet
I think that kind of events could be <Hidden> automatically to avoid your concern, mentioned before.
Is that possible?