Sentence:  90 minutes of almost nonstop hilarity is a good entertainment value. Especially if you're counting in <WSD>dog years</WSD>. 
Meaning of the word marked with <WSD> tags:  A period of time in the life of dogs, defined such that the average life expectancy of a dog in "dog years" is numerically equivalent to the average life expectancy of a human. A 4- and a 5-year-old dog are about as mature as a human of 28 to 30 years and 33 to 35 years, respectively.