Subdural hematoma outlook?

[1940LaSalle]

In an otherwise healthy 59 year old caucasian American male, what would be a typical amount of time for a so-described "small" (no dimensions available) subdural hematoma to resorb completely to yield a clear CAT scan? The most recent scan was done 14 March 2011 and showed no dramatic improvement with respect to a scan done on 3 March 2011.