Blood pressure is governed by five elements--the strength of the heartbeat, the volume of blood, the viscosity of the blood, the resistance of the arterioles, and the elasticity of the arterial walls. An abnormality of any of these can cause the blood pressure to be too high or too low.
Depending on the complexity of the case a trial can last anywhere from one day to six months or longer. If you are asking how long a rape prosecution takes you are probably looking at 6 months to a couple of years.
This part of the trial process can take anywhere from 3 months to a couple of years. Usually though the process is finished in a matter of a few months. Following this, the felony case moves into the trial phase. This phase of the trial process usually takes from 4 days to 2 weeks. However extremely difficult and complicated cases can take several months. This is where the jury decides the case based on the prosecutor's and defendant's attorney's arguments. Once this is done the case will move forward.