Alan,
It depends on the area of copper or the board size you are dealing with.  I
used to work with 6 layer burn-in boards (two ground planes) and I recall
it used to take FOR EVER, to heat (at least it felt that way!).  Make sure
your techs have a good solder iron and a lot of patience.

bilal khalaf



>Further Questions on the subject:
>
>Does this have any effect on hand-manufacturing? ie. Do you have to
>apply heat for a longer period in order to get a proper solder joint?
>Does it take appreciably longer to cool?
>
>Alan H.
>===========================================================
>Alan Hilton, P.Eng.         Phone: (408) 982-0660 X213
>R&D Engineer                Fax:   (408) 492-9170
>Emulation Technology, Inc.  eMail: [log in to unmask]
>2344 Walsh Avenue
>Santa Clara, USA 95051-1301