Only the Administrator has access to this setting.
You can set events to repeat on a daily basis or on the same day each week.
The default is 1 Day : this is a single event on a single day.
If you set an event as 3 days, it will be booked from three consecutive days, starting at the date listed.
If you set an event as 3 weeks, it will book three times on the same day of the week. (e.g. 3 x Mondays from 23/09/2019) It won't book it for 21 days!
You have the option to send a provisional booking email to the hirer with a summary of the booking.