"Making Springfielders eat at restraunt" Xmas edition trick?

So, if I am understanding things right, once you get to the task where they hide in the treehouse, they hide there for 24 hours, then Lisa has a twelve hour job, and then there's a task that says "Open 50 presents", and that's the end of Christmas?

It definitely seems like you should just send every character on the 8 hour task repeatedly for the entire season until you've got two days left, then just finish up Christmas. Is there any reason not to do it this way?