Use the boredom test (I will just copy and paste it from my other thread answer):

We usually make the boredom test. When the movie is almost ready I give it to my wife to watch it. Her only task is to click (make a mark) on the time track any time she feels bored. After that I just cut off all the marked sections.

PS. If you do not have wife you can use any other person who is not afraid to tell you that your movie sucks (obviously do not use smaller siblings or anybody who is strongly dependent on you or you may receive only positive comments - not very useful!) :)
 
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