Well if it fails say 12 hrs or beyond ..... don't worry about it as i usually only do 12hrs, but i figure for fun i run longer this chip and i am 13hrs and 46mins right now on it.

Don't panic or throw around if it fails in less then 12hrs.... me figure it out for you... usually rounding error = CPU volts or Ram timings and if you get a EXAMPLE: Error = AEB666 was expecting 455455HH error or anything like that ... usually means RAM voltage.