MAP test takes about an hour to finish. It has about 40-50 questions. The questions go harder and harder. It depends on how a first grader takes on challenges and how he handles the failure and frustration positively. A couple of wrong turns might cost 10-20 points I guess. My DS told me that a 4th grade girl literaturally cried out loud in the middle of the MAP math test. As long as the trend over a couple of years of longer still show some nice improvement, you don't need to worry about the score flucturation in a single test.
