Primary ferment taking Days longer?

[Twotaureanbrewing]

Typically after I pitch yeast my brew have fermented as follows.

Strong ferment action following morning after pitching.
Temp at 67-68 degrees for about 3-4 days
Temp drops to 64-65 as ferment dies down. By day 5-6 bubbling in blow off has tapered down and krausen has dissipated. Day 7, I transfer and dry hop.

My last 2 batch have taken significantly longer. A good 10-14 days before bubbling in blow off tapers down and krausen to fall. Why is this I wonder? Is it better or worse that it takes longer?

Haven't changed my process. Always use a yeast starter. Ambient house temp is 66 degress. Efficiency has got better, using less grain to hit projected OG numbers. And I feel the beers are tasting better, maybe Im getting better at my process. My main concern is, why has my primary ferment time nearly doubled?

 

[stratslinger]

Same yeast strains, or different yeast strains?

How confident are you in those temperatures being constant (24x7 as well as year-round)? I know my house gets a lot cooler at night this time of year than it does in the spring and summer, and that can play a factor...

As to better or worse - not necessarily either. If you were in a production brewery and trying to maximize profits, then it'd be worse that it takes longer. If you're impatient to try your latest creation, it could be a little worse. In terms of the quality of the beer itself, it doesn't really matter.

 

[Twotaureanbrewing]

Same yeast strains. Been using the same strain on the last 5 batches.

No the house temp doesnt hold yr round, def warmer in the summer. To warm to ferment and hold it in the 60s. It may get a degree cooler or so at night. Im basing the temps on brews since December, trying to keep all factors common.

 

[stratslinger]

OK - is the yeast being repitched, or is it a fresh pitch every time?

 

[Twotaureanbrewing]

Fresh pitch, FG has been close, point or 2 either way. Attenuation is almost 80%.

 

[Twotaureanbrewing]

I guess Im just wondering is this time frame similar to others? I brew IPAs