Hanae Isano Narahashi, also known as Yai, for short.
I present you a field boss timer that actually counts down to the possible times they might spawn!
Mabinogi Boss Timer by Hanae Isano Narahashi
Well it is incredibly self-explanatory.
A white box like this shows you that the spawn chance is inactive and how long it takes until it becomes active again:
[Image: http://puu.sh/3vZ9x.png]
A yellow box indicates that the spawn time is active and that the field boss as a chance of spawning, as well as how long it takes for the chance to go away:
[Image: http://puu.sh/3vZdi.png]
Notes:
Times might be slightly off, however, this is because of issues beyond the control of players.
Monster might spawn slightly, or even greatly outside of their expected spawn frames, although this usually only happens to one or two channels, at most.
There might be times that a field boss does not spawn at all, nothing to be done about that, always make sure to periodically check different channels to see if it's there.
Update #1: a Technical problem has a occured, please be patient as this is being dealt with. [05:16 PM]
Update #2: The issue has been resolved, thank you for your patience. [06:37 PM]