Worlds: any decision on how the 800 will be run?

With over 1,000 entrants in the 800 free I'm curious if there's been any decision how that event will be seeded. With 20 swimmers going at a time that's still 50 heats per pool. With an average heat time of 15 minutes that's 750 minutes or 12.5 hours. The average time will probably be a little less than that, but still it's going to be a long day!