Is It Possible to Trade Part-time Successfully?

I was browsing at Linda Raschke's LBR Group website when I come across this in the FAQ section:

"However, we have yet to come across a trader able to consistently support themselves by trading part time. Ultimately trading is a full time job, and many people new to the business are often surprised by the long hours professional traders devote to their study of the markets."

On the flip side, quitting a full-time  job to trade full time straightaway may bring about undue stress that may impact trading decisions. Seems like one cannot have the best of both worlds huh?

Also reminds me of the many trading educators out there. How can they be going on TVs, flying all over the place, conducting courses, doing all the pre and post course administrative work and yet still be trading successfully?