It depends on the DVR company. I believe that Knowlegy and Midcontinent can hold 80 hours and I think Dish can hold over 200 hours. I'm not sure about the other ones. You could go to there sights to find out.
Again it really depends on how many gigabytes your drive is on your DVR that will determine how many shows the DVR can hold. Usually a 30 gig drive can hold about 30 hours of television, so depending on how big your DVR is will depend on how many shows you can record. Other things to keep in mind are if you are recording shows in HDTV, as these shows tend to take up more space.
2 hours
1h to 2.25 hours depending on quality.
There have been millions of hours of television shows broadcasted since the first television show was aired. People can watch a variety of shows 24 hours a day.
2 shows/hr times 33hrs. = 66 shows (no commercials!)
Shows have been taped during the Summer to be shown it the fall, but they are not recorded a set amount in the future like your question suggests. Location shows have been done many months before all of the episodes have aired, yet some shows air less than a month after being recorded
Eye tissue is stored for no more than seven days.
According to variety, there are 564 award shows a year. 1.5 award shows a day. They give out 4025 trophies. 1 every 2 hours
The Comcast DVR can hold about 400 hours of SD programming.
It has a stored memory,not on time just on space available.
180 minutes ... or 3 hours. However in today's standards of television shows constantly interrupting the commercials, it's hard to tell anymore. :)
h/120
there are 74 minutes stored on a CD