For me, I have for the longest time counted that 24hrs as being back to when Kirk stepped on the deck. Partly because of the stardates but mostly because even in the shuttle craft, as they start to coast, he still has faith in his First Officer:
I figure two days for the trial/hearings. The first day up to the Talos transmission revelation. Then the second day in closed session.
It still won't account for six days maybe but hey, at least there is room for some padding.
KIRK: Spock would have some logical reason for going there.
To me, the indeterminate times are a) the chase, b) trying to regain control of the ship (although 3012.4 to 3012.6 makes it a small window) and c) trying to stop the transmissions ("You are ordered to assume command of the Enterprise. Disable vessel if necessary to prevent further contact." "Despite all we can do, images continue to be transmitted to us from Talos Four.") I figure two days for the trial/hearings. The first day up to the Talos transmission revelation. Then the second day in closed session.
It still won't account for six days maybe but hey, at least there is room for some padding.