Do the Dishes - Level 2 -

This question is for anyone with at least a 2nd grade education. If you are in the 3rd grade or over 30 years old, this question may be a challenge for you.

Troy has to do the dishes every night. Troy doesn't like to do the dishes, so he has perfected a method to finish them as quickly as possible. Each night he is able to finish all of the dishes in 42 seconds. If Troy does the dishes every night for 35 nights, how many seconds will he have spent doing dishes? (Extra Credit if you can figure out the answer in terms of minutes and seconds - watch the video below for the answer)