Hmmm you don't have to be precise, a rough estimate would be fine.
(If this is a duplicate, sry)
As for me......
Total time spent watching anime as of: 6pm on 1-14-2008
(figuring each episode as 23 minutes for an average)
Where have all the good shows gone to?
It's difficult to calculate things like this... if you want to include all the anime you've every watched, that'd be very difficult...
Instead, I believe you can post in these threads, since they have the same, general, gist:
How many Anime episodes do you watch a day?
How many Anime series have you completed watching?
My thoughts on Anime @ www.animananime.com