what will you do in your apare time at work?

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Everyday, we named white color spend 8 hours in our office, but maybe 20-30 minutes is nothing to do or you do not wanna do anything. what will you do? (1)Chat with friends on MSN? (2)Talk on the phone or send SMS by phone? (3)Sow and gain vegetables in your farm? ...... Could you share with me about your secret, and how to avoid disclosure by your boss or lead? Thanks in advance.