I completely agree with you! I'm currently a grad. student in an instructional technology program. I have used Jing in one of my courses, Multimedia Productions, and believe the time constraint is a good thing, along with the character constraint with Twitter. I think it (Twitter) allows the user to distinctly address the most vital information, which can definitely be a challenge. Jing also comes with multiple challenges, such as the time constraint like you mentioned. This allows the user to determine how fast or slow to deliver directions on what is trying to be taught to someone, and also to determine what information is most important to teach the learner.