midnight
As he stepped aboard Jack found Hal pacing the platform deck . `` Keeping deck watch , old fellow ? I 'm glad see that , '' Captain Jack said , commendingly . `` Yes ; I 'm on until midnight . Then Williamson stands watch until three-thirty in the morning . After that Eph comes up and takes the trick until it 's time to call us all . '' `` When do I come on watch ? ''