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

May 26th 2018 (FLCL Marathon)

Time
Show
Ratings
A18-49
10:30pm Fooly Cooly 615,000 323,000
11:00pm 450,000 255,000
11:30pm 446,000 248,000
12:00am 414,000 226,000
12:30am 401,000 227,000
1:00am 387,000 249,000
1:45am 351,000 213,000
2:15am 355,000 212,000
2:45am 316,000 192,000
3:15am 318,000 194,000
3:45am 321,000 198,000
4:15am 292,000 182,000

;
comparison

May 27th, 2017 (Samurai Jack Marathon

Time
Show
Ratings
A18-49
11:00am Samurai Jack 1,031,000 606,000
11:30am 939,000 545,000
12:00am 888,000 519,000
12:30am 843,000 495,000
1:00am 786,000 481,000
1:30am 841,000 534,000
2:00am 784,000 468,000
2:30am 704,000 415,000
3:00am 681,000 408,000
3:30am 642,000 355,000

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.