Is 40+ pages enough for a one shot doujin manga?

Recently Kuroi Kai has been thinking of doing a doujin manga mini series, titled "ASSASSIN HUNTER" and the rough draft he did for the first CHAPTER consist of 51 pages. Unfortunately, he needs to think of the paper budget. As he has (sort of) limited supplies of manga papers to use for doing comics.

So instead of making a mini series for ASSASSIN HUNTER, he'll probably make a one shot doujin manga instead which might consist of up to 40, 50 or 60 pages. So from the rough draft Kuroi Kai did for the first CHAPTER of ASSASSIN HUNTER, he needs to omit a few things from it for a one shot.

Another reason why he decided to make one shots instead of mini series is because he also wants to do other stories besides ASSASSIN HUNTERS.

Other stories to work on includes:

TRIPLE TROUBLE, ROXY ROCKSTAR, INJUSTICE (working title - title will change depending on how the plot goes and how many pages it takes to make the one shot doujin manga), LIKE A VAMPIRE,  and others...

TRIPLE TROUBLE is inspired by the simple sketchy manga Kuroi Kai did when he was in secondary school... about high school rivalries which ended up as trouble in high school until everybody complains about their rival wars...

ROXY ROCKSTAR, like ASSASSIN HUNTER, she is inspired by a fictional character within an unpublished 10 page comic.

Originally ASSASSIN HUNTER was named Bullet Jack in an unpublished comic...