You’re right, my post doesn’t make clear enough the difference between current risk and risk conditional on nuclear use in Ukraine.
Trying to figure out expected hours lost in the latter case seems to depend a ton on which of their forecasts you look at. My instinctive reaction was that 2000 is way too high, as they’re at 16% on Russia using a nuclear weapon in Ukraine so it can only increase risk by a factor of 6 or so if it happens, but they state it’d raise risk by a factor of 10 or so if it happened. I’m going to use the factor of 6 because I don’t understand how they got 10 and it reads like it might just be an order of magnitude estimate.
Using their ‘forecasters’ aggregate’, where the mean is 13, the hours lost conditional on use in Ukraine is still less than 100 hours. Using their ‘full range’, where the mean is 150, the hours lost conditional on use in Ukraine is 1000. That suggests it’s quite important to figure out which of those aggregating methods make more sense, as I suspect the costs of fleeing are generally higher than 100 but less than 1000 hours. (Though fleeing in the least costly way could reduce the costs of fleeing enough to be less than 100 hours and thus worth it even in the lower case.)
This is also tricky because I don’t think it lets you compare to the option I’d actually advocate for, which is something like “flee at a slightly later point”—the US has good intel on Russia, and it seems likely that US officials will know if Russia appears to be headed towards nuclear war. If you have to compare “flee the instant a tactical nuke is used in Ukraine” or “stay no matter what”, “stay no matter what” doesn’t look good, but what you want to compare is “flee the instant a tactical nuke is used in Ukraine” to “flee at some subsequent sign of danger”—that is, the real question is how many life-hours you get by fleeing early that you don’t get by fleeing late (either because we don’t get any warning, or because by then many people are panicking and fleeing).