Free time is among the important bounties that Allah gives to mankind. It is during a person's free time that he can truly dedicate himself to studying, memorizing the Quran, helping the poor and all sorts of good deeds. The proper use of one's free time is a very important means of gaining Allah's pleasure in the Hereafter.
Unfortunately, much of modern civilization is dedicated to entertainment, enjoyment, pleasure and sensual gratification, as can be seen by the dominance and place of movies, sports, music, art, alcohol and so forth. A Muslim must be careful not to allow this civilization, with all of its supposed fun and glitter, to affect him negatively and allow him to waste his precious time. It is very easy, for example, for one hour of benefit-less television watching to turn into two hours, then three hours and so forth. It is very easy to be taken by the things of this world and to spend all of one's time enjoying and seeking the goods of this world. One should keep in mind the words of the Prophet (peace be upon him):
"The worst of my Nation are those who are born into bounties and nurtured in them. Their most important concern is the types of food and the types of clothing, while they are boastful in speech."
[Ibn Al-Mubaarak in al-Zuhd]
"Commentary on the Forty Hadith of al-Nawawi" - Jamaal al-Din M. Zarabozo, p. 1555, 1556