The connection takes 2 to 4 weeks once the activation process has started.
This sync is a 1-way sync as for now TripAdvisor doesn't provide any reliable solution to fetch data from there system. As a consequence, the bookings made through this channel won't be updated automatically to BookingSync and so must be created manually to your BookingSync calendar.
The rental must be published in BookingSync.
You must have a Property Manager account in TripAdvisor (5+ properties).
If you have an owner account but more than 5 properties, you can contact your TripAdvisor account manager to change the account type.