How long will it take for a reported account (for someone under 13) to be deleted on facebook?

[Kenzy and Braydens mom]

We just made a request through the privacy and safety issues of facebook for an account to be deleted, long story short my bf has custody of his 2 kids and on a weekend with their Mother, she allowed the 9 year old to sign up for a facebook, she claims she didnt and his daughter refuses to give up her password to erase it so I went on an sent the form to have it reported and erased, just wondered roughly how long it will take.
I fully agree that without supervision they will do it again, however this is the 1st time in 4 months she has been at her Moms and prior to that was 6+ months, here they are monitored on the computer at all times so no more facebook (lol)