I started trial subscription of Redhat Learning and the Lab Hours consumed very quickly. I am not sure how many hours you get with trial subscreption? I just may be an hour and it gone. Any idea?
The RHLS trial announcement thread states that you get 1 hour of Lab time with your RHLS trial.
This should be enough to give you an idea of what the Lab environment offers you and how it feels.
However, you will hardly be able to complete more than one Exercise during this time.