 This is how you calculate the travel time to one of your stations. We'll stick with station 21418, that's our example station. So we picked the arrival time at 70.26. So we just need to subtract the origin time of the earthquake, which we've already calculated. And here is the answer we get when we subtract these numbers, 0.0195. And remember this is in days. But we want to convert this to hours because later we're going to calculate the velocity of the tsunami. And we want that to be in kilometers per hour. So if we multiply by 24 hours in a day, then we can make this number be hours. And when we do that, we get 0.468. So that is the number of hours it took the tsunami to get from the earthquake to where the station is, a little less than half an hour.