Before a time limit expires, early enough, as in His speech begins at eight, so we've arrived in time. It is often put as in time for, as in Please come in time for dinner. [Second half of 1400s] Also see in good time.
Eventually, within an indefinite period, as in In time you'll see that Dad was right. [c. 1450] Also see in due course.
In the proper musical tempo or rhythm, as in It's important to dance in time to the music. [c. 1700]