For One Week

This passage clearly says that the length of the covenant that "he" will make will be for one week or seven years. I suppose that this could mean either that the covenant will be predetermined to last seven years or that it does not specify a length of time when made, but as it turns out, is only in existence for seven years. Many of those who believe that the entire prophecy of the seventy weeks has already been fulfilled around the time of Christ’s first coming teach that the first half of the seventieth week was fulfilled by Christ’s ministry. "We know Christ’s three-and-one-half-year ministry," says Dr. Gentry, "was decidedly focused on the Jews in the first half of the seventieth week (Matt. 10:5b; cf. Matt. 15:24)." G. H. Pember objects to such a view with the following:
if the Messiah could be the subject, and the time that of the First Advent, we should then be plunged into the greatest perplexity; for the Lord did none of the things that are mentioned in the twenty-seventh verse. To fulfil that part of the prophecy, He must have made a covenant with the majority of the Jewish people for seven years, neither more nor less. But there is no hint of such a covenant in the Gospels. And, indeed, one of the prophets has intimated to us, that the Lord, just before His death, suspended all His relations with the Jews, and through them with the whole of the Twelve Tribes. This exactly corresponds to the suspension of His dealings with the Jews at the close of the Four Hundred and Eighty-third Year, and to the facts of history. Still further, the very next verse of Zechariah carries us over the interval, and brings us face to face with the Prince that shall come, the Anti-christ, who will make the seven years' covenant on pretence of being the Shepherd of Israel. Lastly, Christ did not cause sacrifice and offering to cease, when He suffered without the gate: the Temple-services were carried on for nearly forty years longer.
Further, "it is evident that the covenant is subsequent to the cutting off of Messiah and the destruction of the City and the Sanctuary, in the twenty-sixth verse; therefore, it could not have been confirmed at the First Advent," says G. H. Pember.