Are you sure you trust yourself to know whether it's worth spending 30 seconds to prepare for dying within the next day?
Part of the point is that, on average, it isn't. There are 86,400 seconds in a day; 30/1e6 of that time period is actually closer to 3 seconds than 30.
Perhaps it might be better if I tried applying this rule over a different scale than a day - maybe a week (~ 210/1e6 chance of dying) or an hour (~ 1.3/1e6 chance of dying).
Does something like this seem to you to be a reasonable rule of thumb, for helping handle scope insensitivity to low probabilities?
There's a roughly 30 to 35 out of a million chance that you will die on any given day; and so if I'm dealing with a probability of one in a million, then I 'should' spend 30 times as much time preparing for my imminent death within the next 24 hours as I do playing with the one-in-a-million shot. If it's not worth spending 30 seconds preparing for dying within the next day, then I should spend less than one second dealing with that one-in-a-million shot.
Relatedly, can you think of a way to improve it, such as to make it more memorable? Are there any pre-existing references - not just to micromorts, but to comparing them to other probabilities - which I've missed?