Spock could understand the frustration of being unable to return to the place he belonged to. Spock might have had the Enterprise with him, but without its crew and captain, the ship was nothing more than a shell. And a shell had very little meaning without the substance that gave it life. Yes, even Spock, with his suppressed emotions and staunch lack of feeling, could admit that.
Though it was not like him to admit it, he was very lonely in The City. If there were only one thing familiar to him, he might be able to cope with the absence of the people he had become close to. Unfortunately, very little (if anything) in this place was reminiscent of home.
"I have computed many scenarios and probabilities as to our length of duration in this environment. It is not entirely improbable that we might be returned to our own realities. Though, calculating the time as to when that might occur has still to evade me. I am, however, continuing my research into better understanding this place and its inhabitants."
His manner of speech was professionally robotic, but not without some tiny aspect of concern. Though it was not in his nature to do so, he did wish he had the ability to comfort the many strangers of The City. Unfortunately, that side of him rarely ever made it to light.