I got 8 pages at the third attempt in daytime mode.
The key to win is to recover your stamina by standing in front of Slender with a tree between you and him. If it teleports, start running and then recover again. When you get the 7th page, if you are sure your nearest location will have a page, recover a lot of stamina and then start running to the last page without turning back.
Follow the route shown at the beginning of the video to have more chance of winning (the important thing is to check the bathroom before collecting any page).
00:00 - Page 1/8
02:22 - Page 2/8
03:40 - Page 3/8
04:52 - Page 4/8
05:26 - Page 5/8
06:34 - Page 6/8
07:05 - Page 7/8
07:53 - Page 8/8
08:26 - The End
