The stuff is so active when it's fermenting that if you were to add oak chips at any point other than pre- or post-ferment the stuff would shoot out of the carboy like you threw mentos in cola (from experience

). I've found that the fermentation time can be a bit variable, and a month isn't unusual... The acid blend in my most recent recipe (
New Brunswickan Mead) seems to have promoted a more rapid turn-around on the ferment, but I made good mead using this older recipe with a lower OG than the original recipe promoted (I mentioned 12%... about what the newer recipe should produce).
Short answer: yeah, when I used this recipe and the full whack of honey (16% ABV), the ferment time was a month or more. I would expect it'll slow down a lot in the next week or so.Rack two or three times for clarity, in addition to using a wine fining agent (or gelatin if you're not squeamish about that stuff)... you'll get it crystal clear.
Good job on the temperature control - 1118 is a little bitch when it comes to temperature control... too hot and you end up with paint thinner.
By way of example; I was serving this stuff at six weeks to people at a party out of the carboy - it was very well received (but turned the party into a complete shit-show - giving 16% booze to your guests when they think it's maybe 8% is perhaps unadvisable... oh well, nobody died). Kyle's stuff was fermented hotter, and was undrinkable for some time. Exactly the same honey & recipe.
The problem with sack mead (which this original recipe is), is absolutely one of congeners. I would argue that your long fermentation is in fact a good sign, since the yeasties are taking their time, rather than blitzing through their sugars like a bunch of kids at Easter.
RDWHAHB
