תהלים קב:יד - אתה תקום, תרחם ציון, כי עת לחננה, כי בא מועד
תהלים קב:טו - כי רצו עבדיך את אבניה, ואת עפרה יחננו
Tehillim 102:14 - You will rise, have mercy on Tzion, for it is the time to cherish her, the appointed time has come (alternatively: is coming).
Tehillim 102:15 - For Your servants have desired her stones, and cherished her dirt.
A Moed, an Appointed Time, is not just a moment in time, a date on the calendar. It is a time in history that certain actions towards the Geulah are most likely to succeed during the process of Geulah that comes in its time. The Six-Day War, for example, could not have occurred at any other time.
In chapter 4 of Kol HaTor, it is explained that the Moed will actually move towards us in time. When will this happen? When the second verse's conditions hold true, namely that Am Yisrael will again turn to desire Eretz Yisrael's stones and cherish Eretz Yisrael's dust.
It makes sense if you think about it.
Let's say that the final possible date for Geulah really is the year 6000. This would be if we do not fulfill this verse's requirement. In such a scenario, the return to Eretz Yisrael would be completely forced upon us, with no Awakening from Below. This is later, more sudden, and overall takes more time.
At a certain point in history, by a certain amount of Am Yisrael's actions in the Awakening from Below, we merited that the Moed moved towards us. The year 6000 is not the deadline any longer.
The lesson here is fairly explicit: How much we must wait for the Moed is intricately related to Am Yisrael's attitude and actions in relation to Eretz Yisrael.