Boss respawn times?

Here is the list on StrategyWiki.
http://strategywiki.org/wiki/MapleStory/...o_spawn.3F
It hasn't been updated for a while though so it doesn't have the spawn times for any of the area bosses including Gumiho (Nine Tails ... Keaton).

most of the area bosses have a pretty short respawn time, something like 15-20 minutes. When I am the only one hunting snowman, by the time I go through all the channels, the first channel has reset so I can keep going around with no waiting.