The 100 lap event is not a race, there is no timing being taken. It is a lap of the TT course by one rider (or group of riders if you want to do it as a team) setting off every hour on the hour from the TT Grandstand on a road-legal bike or trike. It doesn’t matter if you take an hour or even longer to do the lap – it’s all at your own pace – so long as you safely complete the lap, that’s what counts.