I'm pretty new to heat treating, just doing Hazel bow, it's had 4 heat treatments during tillering, I've given it 2-3 days minimum after each.
I think it needed longest after the first, the later ones have been more of a top up and seemed to get going quicker.
Mind it's been humid here, if it's not raining then it just about to, or it's just stopped. Getting chilly too.
Del