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Scott, the Humbrol matt white does seem to dry quite quickly, but I suspect you will be adding washes over the top of it. I'd leave it to dry overnight, or you might find it lifting when you overpaint.
Yes, i agree with Steve
I've read that the right time before doing the washing is at least 2 or 3 days
The enamel before 40 minutes seems dry but actually isn't completely cured
Is cured just the superficial coat. Under layers are still wet, so if you try to add washes you'll remove all the paint.
You can shorten time just using acrylics paint as base because the wash thinner doesn't dissolve the humbrol enamels