A well-timed energizer lasts a maximum of 5 to 15 minutes. Short (3-5 min): stretching exercise and an introduction round, highly effective. Standard (10 min): dancing to music, group trivia, a small group discussion. Long (15 min): an extensive team game or workshop. Golden rule: shorter is better. A 5-minute energizer feels fresh and worthwhile; a 20-minute one feels long-winded and distracting. Set clear start and end times and don't let it run over. Brief people quickly and clearly. Never say 'who's joining in?' (too forceful); say 'everyone is welcome to join in' (that feels more relaxed). Live Impact handles the timing and production down to the last detail.