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.
How long criminal checks date back vary by state and county. However, most criminal court vendors will perform checks that date back seven to 10 years. Most employers will only search records dating back seven years in counties in which you have lived, worked or studied.