Have employees' hours added up

[MattJD]

Hello guys, how do I validate that the hour is not repeated in the following record? it is for a meeting room reservation application.

[ScottWorld]

That is not a native part of Airtable, but you may want to take a look at @Kamille_Parks’ Scheduler extension, which provides the functionality you’re looking for:

Airtable

Scheduler - Apps - Airtable Marketplace

Schedule reservations for people, rooms, or equipment on Airtable with the Scheduler app.