It is possible to train yourself using a Training Remote while not otherwise occupied.
The Training Remote item can easily be stored and pulled out for use during hyperspace trips or other idle time. It is a common tool almost anyone can find and access.
To initiate training, you must interact with a nearby Training Remote. It must be held in order to activate it. You can choose between 1 and 12 hours at a time. Each hour of use has a 20% chance of giving a character 15 xp.
While training you cannot start ground travel, use the force, or perform most skilled actions. Your focus must be on the Training Remote.
Training can be aborted simply by interacting with the Training Remote again while in use. Simply click the option that says to abort training. You will be rewarded xp based on how many successful hours you have completed if you are stopping a session that lasted longer than 1 hour.