It's a big staggering though just how long the parties take up these days. In 2015 when I first started planning our 2017 trip
MNSSHP was in the middle of September. Then it moved to the beginning and now it's middle of August (2019). Now I haven't gone through all the years to see when they started but they have typically been increasing each year the number of days taken up by the parties which are multiple times per week.
For the most part you'll see the increase on the MNSSHP because of the timing of the year. There's only so far they can go with
MVMCP. They do a very quick turnaround though between the two parties. In 2019 the last MNSSHP was November 1st and the first MVMCP was November 8th so 6 days in between.