We know Spock served aboard for a stint of sixteen years in a row, eleven with Pike and five with Kirk.
But similar to Picard and the Stargazer, prior to his time with Kirk, how long was Spock with the Enterprise? Spock served with Pike
for Eleven years, four months, five days.
Pike and Spock were both aboard the Enterprise thirteen years before the events of The Menagerie, when the ship went to Talo Four. And they were both (presumable) aboard the ship just prior to Kirk taking command.
But was Spock continuously aboard the Enterprise the entire span of time?