Yeah...they have different models that offer various lengths of battery time and limits of protection coverage.
I think mine is 30 minutes but I'm not sure, can't remember. The main thing is that in the event of an outage I can get everything I was working on saved long before the battery goes dead.
That project I lost had spread sheets, and pages and pages of text. Some graphic files. And I lost EVERYTHING prior to the last time I saved info....which was MOST of the project....ugghhhhhhh