15:50 Honestly, I think the motel was haunted in a sense. Like there were 198 suicides before they even showed up. The wolfsbane only explains why the werewolves were affected. It doesn't explain anything else about that wacky motel. Given what happens later in the show, it's possible that the motel stood on the intersection of 2 telluric currents (and/or ley lines), but we don't have any confirmation.
I think that Darach mostly expected the werewolves would tear each other up when planting that wolfsbane. It took the form it did because the motel is indeed haunted - or maybe not haunted, exactly, but something is seriously off with that place.