Once you have installed your new AAD, it will start a synchronization, but a really cool feature that Microsoft guys have added is when you install AAD, it creates an scheduled task in the local machine, so if you need to change the sync interval o need to run manually the synchronization is it possible!
The only thing that you will need to do is to access to scheduled tasks and modify the programability of the task to adjust the frequency. Once that is done, is enough!
Hope that helps!
Albandrod's Memory 