Six months is about how long it takes to nicely finish brainwashing someone. they used to study with people for six months, by that end of that time they were expected to have progressed to the point of attending meetings and possibly baptism. If you spent six months only associating with Jehovah's Witnesses, it's likely you would be greatly influenced by them, you would be likely to take on their attitudes and thinking. Not every person would then be a believer, but many would.
They don't care about the people who question everything, already have a strong belief system and have critical thinking skills, they know they will never convert them, they are looking for the naive, the easily manipulated, the gullible. If those people spend six months with the JWs they will very likely become believers.
Have you ever heard of Stockholm Syndrome? It's when someone who has been kidnapped begins to identify with their captors.
Stockholm syndrome, or capture-bonding, is a psychologicalphenomenon in which hostages express empathy and sympathy and have positive feelings toward their captors, sometimes to the point of defending and identifying with the captors. These feelings are generally considered irrational in light of the danger or risk endured by the victims, who essentially mistake a lack of abuse from their captors for an act of kindness.[1][2] The FBI's Hostage Barricade Database System shows that roughly 8 percent of victims show evidence of Stockholm syndrome.[3]
