I don't think there is any value given for "allowable" moisture prior to
reflow.

Perhaps whoever said to bake 5 hrs at 120C to determine moisture content
would be the one to determine a value.

I have seen some boards that had many layers and ground planes that needed a
much longer bake - with vacuum to get
the moisture out so as not to degrade during assembly.

Susan Mansilla
Robisan Lab

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