I've been there too, asking myself all kind of questions and learning it the hard way.
It becomes a natural habit, I don't clock it but go by feeling.
Wire doesn't need thatmuch time (*/- 20 - 35sec)
It's relative thin (+/- 1mm) and temperature can penetrate very easely.
Heavier (thicker) objects need longer, therefore, it's recommended to cover them with a protectiv layer to prefend firescale.
Working with argentium is another case.
Ganoksin is awsome and has always been awsome.
Ganoksin is -to me- a forum WITHOUT boundaries, worldwide and everybody is welcome!
By the way, I'm from Belgium -)