I went fully psychotic with constant voices literally overnight this is called acute onset but some people have a much less dramatic start. Searching for prodrome might be helpful. There are also specific indexes called sips and sops that sort of measure possible onset psychologists are the only ones I know who use these. Not all people get full blown psychosis or schizophrenia though. You might want to check out brief psychotic disorder that can last a very short time like a day and you return to full functionality. Usually that type of psychosis is stress based as in unusual stress like somebody close to you died or you got fired or even promoted to a harder job but it doesn't have to be. Have you been sleeping well...lack of sleep can also be triggering if you have the tendency.