Spock had just returned to the Enterprise, it seemed to me that Scotty was making a joke about not going back to Vulcan in a hurry.Hmm. I'll see you that and raise you Mr. Scott at the end of TMP, on the newly refit Enterprise: "We can have ye back on Vulcan in four days, Mr. Spock..."
I know, I know. Speed of plot and all that rot. Nobody seems to like my canon-preserving idea that Spock and T'Pring weren't actually about to get it on when duty called, and it didn't appear either was going through ponn far...![]()
He wasn't actually indicating that it would really take that long.
Plus, Scotty was infamous for adjusting his time references to fit the situation.