Exactly. 5 minutes. That's all you'll need to get a first impression of the Contacts app. Simply open the MS Teams Store and install the Contacts app. Of course, it's completely free and 100% without obligation. In the app you'll find dummy contacts you can use to test the search, pinning of favourites etc. at your leisure.
We're happy to provide you with a test account so you can use Contacts in your live environment for 30 days free of charge. This will allow you to set up the data connector, connect your applications via drag & drop and make the Contacts app available to any number of MS Teams users. The test account is also completely without obligation and won't cost you a penny.