Kairos and Chronos

What is the difference between the two concepts of time kairos and chronos?
James Quek:
The best way to differentiate between chronos and kairos is to see time as either a flowing river which carries us away (chronos), or a quiet lake which we swim in (kairos). We all experience time as both, all the time, in whatever we do. We experience chronos when we are impatiently waiting for something to be over and done with. We experience kairos when we are so deeply engrossed in an activity that time seems to stand still. In chronos, we are stressed—in kairos, we are refreshed.