i'm not sure what the duration of sex has to do with whether or not she's satisfied...or do you mean, how long does an orgasm last for a woman?
as to how to tell, you're gonna have to ask her. what some may tell you is a dead give-away she's faking, another will say is a sign she's having an orgasm. it varies by person, and sometimes, by orgasm.
i'd suggest voicing your concerns. reassure her that you want her to be satisfied and that you need her to let you know what she enjoys. when she fakes an orgasm, she's giving you false positive reinforcement--which only prevents you from learning what she really enjoys and keeps her from having a real orgasm.
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