
Test cricket, which is the longest format of the game and also the oldest, plays out over the space of five days and is broken up into several playing sessions. The International Cricket Council (ICC) has put in place rules regarding breaks, which include the innings break, to see that players get enough rest, which at the same time does not stop the free flow of play.

How Long is an Innings Break?
In Test cricket, an interval of 10 minutes is provided for the innings break. This is to allow the fielding team to prepare for the oncoming set of batsmen and the incoming team to get organized for the act of bowling. The innings break is of shorter duration as compared to lunch and tea breaks, which are pre-determined in time.
Relation to Lunch and Tea Breaks
If an innings ends right before lunch (40 minutes) or tea (20 minutes), the interval is not taken, and the long break which is due is taken at lunch or tea time. Also, if a team is out with 5 minutes to lunch, for instance, we will take the full lunch break, not a two-minute break.
Variations in Special Circumstances
Match authorities have the right to change the time of breaks for weather, bad light, or stoppages. If the innings ends near the fall of the day’s play, the umpires may just call stumps instead of a break. This is a matter of administration, which also sees to it that there aren’t too many disruptions and that flow and continuity are maintained.
Wrap Up
So in Test cricket, we have a break point at 10 minutes, which is the standard unless, of course, there is a scheduled break for lunch, tea, or the end of the session, in which case the scheduled break takes priority. Breaks are put in to give players a rest and to also preserve the traditional, disciplined flow of the game.