If you are a PMS user, the sync time between your PMS and Rentals United depends on which PMS you are using. In the Help Desk in 'Sales channels' you can find more information about your specific PMS.
The price/rate sync between Rentals United and the sales channels, depends on the channel you are connected to. For the HRSes (Booking.com, Expedia, Agoda and Ostrovok) the price sync is instant but there can sometimes be a bit of a delay due to high traffic.
For the majority of the other sales channels, the price sync is every hour. To get more information about specific channels, please refer to 'Channels' - 'Channel Info' in your Rentals United account.