Pinpointing the exact time crisis is beginning is undefinable bc it is different for everyone. Indicators you are going into crisis though include when you start isolating yourself almost all the time if not all the time, can think of no good reason to live (or if homicidal - to let someone else live), find yourself plotting out methods, finding ways to make it "easier", and really don't want anyone to try to stop you anymore... Those are indicators. You don't need to present all of them to be in crisis, and there may be symptoms unique to you as well. (For me, when I get into crisis I start thinking of my mom more)