Total loss of hours available to the general public over those days this year is 10 hours....almost a full day of park operations at that time of year.
I love statistics. You can make them "prove" almost anything - even when t h were isn't an actual cause-and-effect. Over 49 nights, guests 'lose' a total of ten hours of attraction access. Most affected are February visitors, and chances of anybody encountering more than two DAHs in a single visit are low.
I don't know of much that stays the same year over year.
January 18 & 19, 2017: MK closes at 8, just as it does January 20/DAH date
January 24, 25, 26, 2017: MK closes at 8, just as it does January 27/DAH date (closes at 6, 1/23)
January 30, 31, February 1, 3 2017: MK closes at 8, just as it does February 2/DAH date
February 5, 6, 7, 9 2017: MK closes at 8, just as it does February 9/DAH date
February 12, 13, 14 2017: MK closes at 8, just as it does February 16/DAH date
February 27, 28, March 1, 2017: MK closes at 8, just as it does March 2/DAH date
March 5, 6, 7, 8, 2017: MK closes at 8, just as it does March 9/DAH date
So while there is a small chance that someone who visited during the comparable 2016 dates
might find themselves with zero to fewer MK hours, 2017 visitors will find the park is open the
exact same hours on the days leading up to the DAH nights.