How long on stir plate?

[coyotebrew]

Got some czech lager yeast, got about cup of dme and 6 cups of water, its been on my stir plate for about 13 hours, now it seems to throw the stir bar. Is it long enough, can i cold crash or should i swirl it every once in a while for a few more hours?

 

[beardown2489]

Treat it like a beer. When the yeast start to drop out, you'll know it's done. Might take a few extra days this way I guess but beer takes patience. I check the gravity... but be extremely cautious with sanitation
Edit. This second method probably wouldn't work with a hydrometer due to volume . You'd probably need a refractometer

 

[brew_darrymore]

In my opinion, 13 hours is too soon.

I'd keep it for at least 24. And yes, shake it every now and then.

 

[BigFloyd]

Slow down the speed of your stirplate so it doesn't throw the bar. You don't need a big vortex, just a little dimple on the surface.

24 hours is about as long as I'd go on the plate.

 

[coyotebrew]

Slowed the stir plate added more water and put some danish lager yeast(saved from a previous batch) and it came back to life. I was thinking it had too much dme in it. Hence the water, then i figured it didnt have any yeast nutrient in it, so i gave it a little danish yeast. Seemed to do the trick.