Solution
Friday morning.
Queen Margaret was having a conversation with Jessy in her study room.
"When are you going to bring the first human back to her family?" the queen asked.
"Hmm...tonight midnight after the last blood transfusion...Mother," Jessy answered.
"Okay, just bring the woman here in my study room, I will be waiting for her," Margaret said.
Jessy asked, "How long it takes for the memory to be wiped out from the woman, Mother?"
"Since we are not going to wipe out her whole memory, more or less it can take more or less thirty minutes up to one hour," Queen Margaret replied. "Do you already know the place where you would take the woman?"
Jessy nods her head. "Yes, I have checked the place already, and everything is ready for her comeback...her parents and her kids will be happy to see her again."
"That's good, see you later, child," Queen Margaret smiled and rose from the chair signaling that their conversation has ended.