one, never needed anymore.
i time it ,write down start end time,(wrist - watch)
around 16, mins.
offcourse you can speed up drying time with a hairdryer.
well im saying speed up ,just to make sure at the end of the time you could give the scalp a few blasts with the hairdryer, warm/cool
having seid that i did a touch up on my hairline and for the first time
i reduced the bonding time to 5 mins,and facilitated drying time with a hairdryer, bonded rock solid.
so its still a learning game.

just what my hairdresser taught me.
and great advice from toplace forum.