Bump - still take care not to rub the ink off for a week or two yet. I was at the printers today and they've put the slow cure times down to the particular vegetable-based (read: "eco") inks used and the gloss substrate in some reasonably humid weather conditions.
Apologies for the inconvenience, but I feel that it's my duty to alert you to the facts.
I'm actually covering mine in satin-finish Contact this weekend so that it lasts for years. Noice!