At least how many hours you spend on revision one everyday?

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Hi, nice to meet you all here guys and ladies. We spend a lots of hours on my lotting, computer, watching TV/ movie and chatting everyday. However, at least how many you spend on doing revision on everyday? For me, i spend at least 4-6 hours to do my revision. Some times, i felt that , it is not enough for me. It is because, i really have many things need to revise. So, how about you all here? How many hours you spend on doing revision on everyday? Thanks for your response in advance. Have a nice day and happy my lotting.=)