FIDE rules
8.1 In the course of play each player is required to record his own moves and those of his opponent in the correct manner, move after move, as clearly and legibily as possible, in the algebraic notation (See Appendix C), on the scoresheet prescribed for the competition. It is forbidden to write the moves in advance, unless the player is claiming a draw according to Article 9.2, or 9.3 or adjourning a game according to the Guidelines of Adjourned Games point 1.a. A player may reply to his opponent’s move before recording it, if he so wishes. He must record his previous move before making another. Both players must record the offer of a draw on the scoresheet. (See Appendix C.13)
8.4 If a player has less than five minutes left on his clock at some stage in a period and does not have additional time of 30 seconds or more added with each move, then for the remainder of the period he is not obliged to meet the requirements of Article 8.1. Immediately after one flag has fallen the player must update his scoresheet completely before moving a piece on the chessboard.
In OTB tournaments you must record each move, but even with a couple of seconds time delay (5) after you hit the clock before your opponents clock begins, At a G/60 tournament game when both players had about a minute left for the game they BOTH stopped recording their moves in a mad scramble to try and FLAG each other. I noticed the tournament directors observing the game. Question : did they violate any USCF rules ? and i believe only in OTB blitz tournys that you do not have to record the moves with under a minute on the clock ! THANKS