Thanks, everyone.
It turned out that I purchased a 150mm tube of Flake white [it's heavy], but it took as long to dry as my titanium and zinc paints. Also, the Mars Black I bought didn't seem to dry especially quickly. Each of these tested straight out of the tube.
Perhaps I should do the test again someday. For now, I'll put it down to experience that you have to test for yourself.
I've proceeded using a fast drying 'Underpainting White' by Art Spectrum [Australian Brand].
Regards from down Under!
Eric
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