When people talk about "60 years of occupation," what do they mean? Occupation of what? Israel has occupied the West Bank and the Golan Heights since the 1967 war. Gaza is not now occupied by Israeli troops, nor are there any Israeli settlers living there - although I think one could fairly argue that Israel still controls Gaza because of how it limits entry in and out. The occupation of Gaza thus lasted from 1967 to 2005.
The only piece of territory that Israel has "occupied" for 60 years is the land within the armistice lines of 1949. A quote from a local "anti-occupation" organization says "This art installation [a fake checkpoint] aims to provide a glimpse into the daily lives of Palestinian civilians who have been living under a violent military occupation for the past 60 years."
Does this statement mean that the Palestinian citizens of Israel have been living under a violent military occupation for that period of time? It is true that until 1966 Arabs in Israel lived under military rule - but not since then. And while there is discrimination against Arab Israelis, and there have been some violent clashes between Israeli Arabs and the police, it is not true to say that they are living under a "violent military occupation." In fact, some Arab Israelis serve in the Israeli army - especially those from the Druse, Bedouin, and Circassian communities.
Thus, while the quoted statement is factually incorrect, it seems to me that it implies something else too - that the state of Israel itself, within the Green line (the armistice lines of 1949) is merely an illegitimate military occupation, with all that implies legally. Those who "occupy" land are supposed to leave it at some point and hand it back to its legitimate occupants. Thus a reference to "60 years of occupation" is actually a statement that the existence of the state of Israel is in itself illegitimate, and that those who live in Israel by virtue of the establishment of the state are also there illegitimately. The Jews who arrived in Israel in the wake of statehood therefore have no legitimate status - they are merely "settlers" who have illegally settled in an occupied territory. And, simply, they must now leave and return to their homes - which of course, do not exist any more... (at least, those Jews who came from Poland or Iraq or Tunisia or Ukraine).
Such is the possible meaning of a little phrase....