There are no regulations governing length of intermissions between sessions of the same or different events. Care should be taken to allow participants sufficient time to relax and/or eat as appropriate. In situations where there is to be either no intermission or only a short one, advertisements should make this point clear.
During the course of a session of pair type play, it is customary to give one or two short breaks in order that players may have some non-playing time to attend to personal comfort or just to relax for a moment or two. These have come to be referred to as hospitality or smoking breaks. Swiss or Knockout teams have natural breaks at the end of rounds or segments of play.