Here's the breakdown:

Looking out the window: 22%
Sleeping: 6%
Hiding under tables: 6%
Interacting with other family pets: 12%
Consuming digital media: 6%
Playing with toys: 5%
Eating or looking at food: 4%
Climbing on chairs or kitty condos: 8%

Yes, that's only 79% of their time, but what do we expect from a cat food company press release? They also said this when asked if the cats will ever get movie cameras instead of just still photo cameras: "We are in the think tank now." Funny, 'cause regular people on YouTube tape their cats alone all the time. A very scientific search finds that cats spend their time doing the above things and more!

Above, a cat who has named himself Lorenzo talks to the camera about what it's like to be all alone.

This cat flushes the toilet over and over all day:

This cat, in time-lapse, defies the rules by sleeping:

These four cats both look out the window AND interact with each other:

And, best for last: this cat has a companion dog who gets food out of the trash for them to eat...the very second their owners leave:

What Do Cats Do All Day? Kitty Cam Has the Answer [AP/MSNBC]

[Flushing, New York. Image via AP]

A fan watches as a cat runs on the field during the New York Mets home opener baseball game against the San Diego Padres at the team's new stadium, Citi Field, in New York, Monday, April 13, 2009. (AP Photo/Kathy Willens)

[Images via Cute Overload.]

Additional cute: Baby squirrels rescued from Hurricane Gustav.
Also: A clip about pets and the economy. (Starring my sister.)