All data obtained from @SonOfTheBronx on Twitter:
Son Of The Bronx/Programming Insider

July 1st, 2017 (Attack On Titan Marathon)

Time
Show
Ratings
A18-49
11:00am Attack On Titan 825,000 486,000
11:30am 716,000 429,000
12:00am 664,000 406,000
12:30am 590,000 332,000
1:00am 488,000 259,000
1:30am 457,000 242,000
2:00am 467,000 260,000
2:30am 460,000 255,000
3:00am 465,000 279,000


comparison

July 2nd, 2016 (HunterXHunter Marathon)

Time
Show
Ratings
A18-49
11:30am Hunter X Hunter 1,156,000 637,000
12:00am 906,000 498,000
12:30am 850,000 482,000
1:00am 809,000 465,000
1:30am 805,000 458,000
2:00am 781,000 425,000
2:30am 705,000 393,000

If you want more data, you can check my spreadsheet here. That will have further data including per year difference and A18-49 differences.

Let us know what you think in the comments below about the ratings.