In what circumstances will a court reject a claim of duress in a sexual assault case?

In People v. Sanchez (1989) 208 Cal.App.3d 721, 256 Cal.Rptr. 446, the Fourth Appellate District followed Pitmon and rejected the appellant's contention that evidence of duress was lacking in his trial for violating section 288, subdivision (b) repeatedly over a three-year period. The court noted that when the offenses began, the victim was eight years old and viewed the defendant, her grandfather, as a father figure. (208 Cal.App.3d at pp. 747-748, 256 Cal.Rptr. 446.)