FWIW, if you need to wear them immediately no harm or loss.
I regularly use the apply and brush in 15 min strategy.
But we are talking about a whole different animal when you are trying to cure cordovan dryness.
I have cured cordovan dryness on the darker shades with the product known as; "Leather Honey"
Nevertheless, I would not dare to put LH on whiskey, ravello, cognac, saddle etc because you run the risk of permanently darkening the shade.