What is the ruling on a woman delaying ghusl from masturbation if semen is discharged two or four days later, or if ghusl is not possible because she is outside the home?

If semen is discharged after two or four days without lust, then ghusl is not obligatory according to the majority of scholars. However, the Shafi'is hold the view that ghusl is obligatory. The more preponderant opinion is that ghusl is not obligatory, due to the absence of semen discharge with lust.