All data obtained from @SonOfTheBronx on Twitter:
December 21th, 2019 (One Punch Man Marathon)
| Time | Show | Ratings | A18-49 |
|---|---|---|---|
| 11:00pm | One Punch Man | 493,000 | 285,000 |
| 11:30pm | 450,000 | 259,000 | |
| 12:00am | 454,000 | 260,000 | |
| 12:30am | 418,000 | 233,000 | |
| 1:00am | 380,000 | 226,000 | |
| 1:30am | 350,000 | 198,000 | |
| 2:00am | 321,000 | 184,000 | |
| 2:30am | 290,000 | 168,000 | |
| 3:00am | 284,000 | 170,000 | |
| 3:30am | 250,000 | 147,000 | |
| 4:00am | 211,000 | 122,000 |
December 22nd, 2018 (DBS Marathon)
| Time | Show | Ratings | A18-49 |
|---|---|---|---|
| 9:00pm | Dragon Ball Super | 459,000 | 175,000 |
| 9:30pm | 455,000 | 190,000 | |
| 10:00pm | 437,000 | 200,000 | |
| 10:30pm | 411,000 | 210,000 | |
| 11:00pm | 487,000 | 257,000 | |
| 11:30pm | 405,000 | 236,000 | |
| 12:00am | 377,000 | 213,000 | |
| 12:30am | 406,000 | 227,000 | |
| 1:00am | 380,000 | 223,000 | |
| 1:30am | 402,000 | 248,000 | |
| 2:00am | 433,000 | 267,000 | |
| 2:30am | 379,000 | 245,000 | |
| 3:00am | 320,000 | 234,000 | |
| 3:30am | 310,000 | 200,000 |
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 th4e ratings.