The beauty of a fixed time format is it removes that distance barrier and allows you to focus on pure running. Doing 2-mile laps is easy, you keep on running until the time runs out or until you get tired.
You can take a break to rest or even nap between laps, the choice is yours. Yet, even when tired, your mind keeps telling you that you can do one more lap, then another, and another, before you know it, you've run more miles than ever before and you feel awesome for hitting a new milestone.
Remember, you will get out of this exactly what you put into it. Run solo or team relay.