Bottom line -- its a crap shoot. Its very random. nilbog said years ago that they adjusted his spawn to be like that of the south ro AC -- it is a random spawn off of a set of unknown PHs (like the AC). Nobody knows what the PHs are because all mobs in cauldron are 2.5 min except presumably his placeholders. If you do nothing but sit in the zone, he will eventually pop due to fab 4 killing his placeholders, but you can also force him to spawn by massacring the mobs in hopes of killing a placeholder yourself (again - no gaurantee you can do this)
One thing that I have all but confirmed in my dozen or so kills of him since green launch is that he always spawns at nighttime and will stay alive until death. I've only ever witnessed him pop during the hours of 6PM to 6AM. Usually Midnight to 4am personally except the one time I saw him pop just at dusk. Again -- could be nothing but I do feel quite confident he is a night time spawn or at least a "time window" spawn that was coded that way, much like the SRO AC is a night time spawn.
Good luck.
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