We've found that a 10 or 15 second time delay to work well.
However, if you are using our RaceReplay software, you want the Time Delay to allow enough time for the instant replay to complete. The formula below can help you set the time delay.
Time Delay >= Replay Start Delay + (Replay Duration * Replay Speed * Number of Replays)
Replay Start Delay is the amount of time that you want the audience to see the race results before the replay is shown.
Replay Speed needs to be factored in, especially if you are doing slow motion replays.