Timed limit? When you say locked out, are you saying that you try to reconnect after some period and the reconnection is unsuccessful? Or are you saying that during a live session you sometimes get disconnected?
The regular remote desktop will continue to be free.
Managed remote desktop will eventually be a paid product, designed for those that need to manage large numbers of remote connections through a management interface. If that's what you're looking for you can sign up for the free beta here:
https://www.msp360.com/remote-desktop/managed.aspx