For non-Duke researchers, there seems to be inadequate parking for any kind of extended stay in the library.
ANSWER PERSON RESPONDS: And inadequate parking for attending campus events, or even for Duke employees! Answer Person shares your frustration, and, sometimes, the excitement of looking for an available space . . . in Durham County.
One thing that might help is a guide to parking for outside users. It is located at http://www.lib.duke.edu/reference/directs.htm.
Happy hunting.