I pulled the mite tray again today, after 24 hours, and found quite a few mites--but not enough to warrant intervention.
There are some frustrating things about this method. It's hard to know how to count, for one thing: it was clear to me that some of the dots I counted were exoskeletons, rather than whole mites. Do they count? Surely they're a sign of a whole mite, living somewhere in the colony, but do they count for THIS count? So confusing.
At any rate, I counted two or three different ways, and had my son Sam count as well, and we got a range of anywhere from 23 to 32 mites dropped in this 24-hour period. Most of the sources I've read say that you needn't intervene until you see 50-60.
Phew.
Here's what a tray looks like, and what I'm having to count:
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