What are the factors used to determine the result of jury deliberations in a murder trial?

^6. Defendant claims that the jury's read-back requests and the length of deliberations (approximately 7 hours over two days) suggest the case was close. However, considering the length of the trial and number of witnesses, the deliberations were not particularly lengthy, and the jury had to spend a portion of that time determining whether defendant was guilty of first degree murder. Further, even if the deliberations could be characterized as lengthy, this "could as easily be reconciled with the jury's conscientious performance of its civic duty, rather than its difficulty in reaching a decision." (People v. Walker (1995) 31 Cal.App.4th 432, 438-439.)