This Tough Mudder is set to be the biggest event in Australia this year, having the most starting wave times. On Saturday, the first wave (not including the Operation First Dawn) is at 8am, and the last wave being released will be 1:15pm. If my maths is correct, that's 22 waves on just Saturday alone.
On Sunday, the first wave is at 9am, and the last will be 10:45 - 8 waves being released.