Wars are unpredictable. Even the Israelis and the Iranians cannot know how their current conflict will end.
There are, however, a number of analogies to consider. The first is the six day war of 1967. The second is the Iraq war of 2003. A third scenario is a new type of conflict in which Iran uses unconventional means to strike back against Israel and the west. That could turn into a hybrid war, potentially involving terrorism or even weapons of mass destruction.
The Netanyahu government would love a rerun of 1967 — in which an Israeli pre-emptive strike destroyed the Egyptian air force on the ground, in preparation for a rapid victory over Egypt, Syria and Jordan.