A little bit of time to work on this today....still have to tackle that darn stem. I also e-mailed Staedtler today to inquire about the lightfast qualities of their markers. Didn't find anything on their website.
I've heard from another artist in one of the forums that the Faber Castell PITT markers are good. So I will also have to research them.
The drying time was a bit longer than I had anticipated when I did the underpainting with the markers. Here is CO it was about 24 hours, in a more humid climate it could be longer.