The lack of completely explicit speed references within the movies forces a broad range of estimates, reliant on several implicit references.

From ROTJ, we learn that time dilation may occur in hyperspace travel; while the account of less than a day passing on the Falcon en route to Alderaan is appealing in some respects, the only constraint is that the trip must take no more than ten days per Han's promised payment date.

Perhaps different ships have widely different speeds; however, the plain and simple truth is that the whole range of 10,000 to 1,000,000 c will fit about equally as a top speed for hyperdrive into the Star Wars hexology.