Come on man, I don't think he's judging anyone! Now, Troldhaugen may correct me if I'm wrong, but he was just curious about this incident. To answer the question, yes it is a legal thing to do and although I'm not certain, I'm sure it could be done not only in war zones, but in daily life. I do know it is done in ill health. However, there is not set time. I know some catechumins came into the Church only three months and others after three years. It's dependent on the individual's spirituality and the spiritual father's state. Remember, that St. Paul baptized men just after telling them about Christ.