Question about my brew - how long should fermentation take?

[Tortus]

I'm brewing a Shiner Bock clone from AHS. It's a mini-mash.

OG - 1.050

I made a one liter starter for it. I pitched the starter as soon as it got down to 75 degrees, then I put it in the fridge to start dropping the temp to 55 degrees.

About 18 hours later it started bubbling. 24 hours after that, the bubbling slowed to almost nothing. It was really only at a fast fermentation for about 18 hours. Is that all? Should it be slowing down so much already?

 

[breez7]

Bubbles don't prove fermentation. Take a gravity reading.

 

[mrk305]

were you using a lagering yeast which was meant to ferment in the 50's ?

 

[Tortus]

were you using a lagering yeast which was meant to ferment in the 50's ?

Yes, I was using a White Labs Bock Yeast 833.