to be fair, the article is rather specialised and technical,so .. time to pick another journal!
but i was hoping that its brevity  would work in my favor.
it was a high-profile journal and they told me in 6 months,
which is probably as merciful as rejection gets.
 the page count is 16 in their format; under the amsart template, it would have been 15. (to be fair, though, it relies on an explicit construction of mine from an earlier 30+ page article.)
so in case you're wondering, no: i'm not sending it to Proc. AMS. i already have a joint article published there, and it would be nice to try something new.