POLL: generally speaking, how long is TOO long to continue working at a job that one hates? ~

I might go one shift just to see if it gets better. Fortunately that has never happened to me other than some household chores.

maybe you shouldnt stay there then and if you dont want that job i'll gladly take it off your hands

I worked one day at a commercial laundry. Another job at a sugar beet/ sugar factory lasted 2 weeks. I was hired by the Ohio State Highway Patrol as a maintenance man, but never actually started. (perhaps a dumb choice because I coulda been retired with a nice state pension 15 years ago)  I was a golf caddie as a teen, I went 9 holes and quit. 

It depends.  That's the truth.

my job makes me wanna die but i have been there for 9 months

When your anxious before you go and depressed when you leave.  That kind stress can lead to serious health problems, including stroke and a heart attack.

I know I have quit over 100 jobs if not more, in my lifetime.  (way more, actually)

So, it depends.  I have a lot of reasons, a lot of regrets and there is no one-size- fits -all answer.  25 percent of them were jobs I could KILL myself for leaving.   The rest?  Meh.  Probably a good reason why I walked out.  Waste of time, that type of thing.