It is now 22:30 and I’m calling it a close. I won’t be reading anything else for the next 10 minutes, and it’ll likely cut close by the time I’m done with this post anyway. 
My 5 and last update for this challenge; My concentration is definitely waning, and has been since the evening started really (I took a small nap around 5pm which helped a little. 
) so I jumped around a bit to keep my interest fresh and stuck to mostly manga.
What I read: 23 pages of のぼうの城 上 | L30?? in 47 minutes. NANA―ナナ― 1 | L27 in 2 parts, 184 pages over the span of 1h36 total. What was left of https://learnnatively.com/book/3a454b62a4/ ; about half; ~63 pages in 35 minutes. What was left of 鉄腕アトム 1 手塚治虫漫画全集 | L24?? ; about a third, ~44 pages in 45 minutes.
Results!
| Book | Start | End | Pages | Time |
|---|---|---|---|---|
| 虚像の道化師 | L34 | 337 | 475 | 138 | 3h1m |
| こいものがたり 2 | L20 | 0 | 287 | 287 | 1h58m |
| のぼうの城 上 | L30?? | 46 | 69 | 23 | 47m |
| NANA―ナナ― 1 | L27 | 0 | 184 | 184 | 1h36m |
| 鉄腕アトム 1 手塚治虫漫画全集 | L24?? | 79% | 100% | ~44 | 45m |
| https://learnnatively.com/book/3a454b62a4/ | 51% | 100% | ~63 | 35m |
| ナリワイをつくる 人生を盗まれない働き方 | L24?? | 62% | 67% | ~13 | 19m |
That makes for a total of 752 pages and 9h1m (541 minutes)! 
My brain is tired but that was a blast, haha. I’m going to update my results to the board and then I’ll shut down for the day.