pending_connections_are_bounded_and_hello_expires gave the router 20 ms
to register a connection and then slept 80 ms past a 40 ms hello timeout
before reading the count once. Both are claims about how fast this box
is, not about the router: the first failed once in 20 whole-crate runs
beside four busy loops. Both now wait for the event they are about, under
the suite's ordinary ten-second bound, so the test still fails if a
pending connection never registers or a pending Hello never expires.
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