According to a new report by Nielsen Online (pdf), most online videos in the U.S. are watched at work between 9am and 5pm during the work week. 65% of all online viewers use this time to watch their favorite online videos, while only 51% watch online videos during this time on the weekend. Not surprisingly, weekend nights between 11pm and 6am attract the fewest viewers.
Nielsen also released its online video ratings for October, which showed YouTube leading the pack with a total of 5 billion streams and 82 million unique users. Hulu recorded the biggest gains since September and now ranks as the third-biggest online video site.
Interestingly, Nielsen also saw a 3% decline in overall viewers from September to October, even as the number of total streams increased slightly by 1% and the number of streams per viewer increased by 4%. Viewers in October watched close to 172 minutes of video online, a 10% increase from September.
Nielsen's numbers for October are generally in line with the comScore numbers we reported last week. Nielsen also saw a slight decline in total streams on YouTube from September to October as the online video market has become more diverse.
Overall, these numbers are in line with other numbers we have seen lately, though the decline of overall viewers is somewhat puzzling. It is also worth noting that in March, CBS reported that its online viewership peaks at 7pm on the East Coast and again at 7pm on the West Coast.

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It's interesting I thought there may be big amount of viewers viewing You Tube in evening hours from 6pm-8pm ,but report says all are You Tube videos in the Working hours.
I guess those people are exhausted and bored on their work that is why they watched their favorite movies on youtube on working hours.
The similar applies for Online banking in Europe:
Most transactions are being carried out on:
1) Monday morning between 8:45am and 10:00am. Thus early as you need to.
2) Then between 6:30pm and 9:00pm.
3) The same pattern for the other working days but at a lower level.
Thus after the weekend you want to clean up your account (having spend too much) or change your savings (didn't spend anything).
Tell me something I don;t already know.
And they pay money to do this kind of research. Amazing;)