I've heard some variances on the time needed to get a soap to 'cure'. Is the lye truly converted at the time of soponification? If so, the soap 'could' be used immediately. Or does it need time to sit before the lye is neutralized? Is the 'cure' time just time in order for the soap to dry out? And, if this is the case, what do you recommend? I've heard everything from a week to a year.