Biggest winning margin you've seen at the track

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Today I saw a horse (and I thought it was a pretty average one too, only 1 win in 6 starts before today ) called Waicou Wasp destroy a field by 14 lengths. Was obviously not a strong field, but still impressive to watch.

With a really massive win like that seeing the race on TV really doesn't do it justice, you have to be there to see how big the distance is between the winner and the rest of the field.

Just wondering what the biggest margin you guys have seen when you've been at the track is.