It's 9am-6pm but I guess it's just the industry standard. I believe you can make personal adjustments to the timing as long as the both of you are agreeable. You can also pay her more if you need her to work longer hours.
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From this website, it says that day time confinement nannies work from 9am to 6pm. http://www.confinementnanny.com/services/duties/
Normal practice is from 9am to 6pm. If you need the confinement lady to come in earlier please make an arrangement.
They usually come 9am and leave at 6pm but I am sure the timing could be arranged with the agency.
thanks