How much patience is needed in a PhD? I am a PhD student who works in theory. I have been patient but nowadays I am losing my temper, patience, etc. Many publications have been rejected as well as my proposals for grants. I have submitted one research paper which was also recently rejected. 

I am working very hard but also feeling disheartened about the way academia works. As a student it is very hard to be patient. I worry each time my proposals get rejected or even if I have a failure in my research. I am trying my best to be patient but I don't know how to keep it.

Question:  How much patience is needed while working on a PhD? (in terms of number of years for a publication) Is there any way to not worry about the failures we have in academia?
The PhD is a test of your stubbornness, patience and grit more than it is a test of any sort of intelligence or ability.