While chronos refers to chronological or sequential time, kairos signifies a different sort of time, a moment of undetermined period of time in which something special happens. While chronos is quantitative, kairos is qualitative.
Although I strive to be most efficient in time management so far as chronos time is concerned (I am rarely if ever late, taking pains to ensure I don't miss an appointment, always looking to where I need to be next, and so on), I find that I am really bad in dealing with kairos time (the unexpected, the unplanned). It's something I really struggle with.
It's true of course that God's timing is not necessarily man's timing. That's probably because God works more to kairos time...
Ecclesiastes 3:11 (Contemporary English Version)
God makes everything happen at the right time.