How is the second fermentation of a lager beer must be?

[jvend]

How is the second fermentation of a lager beer must be? A lot of bubbles and activity or real slow? The color changes there? How I know when its ready?

 

[Nateo]

From Noonan: If the hydrometer reading at racking is one-third the density of the original graivty or greater, ferment for seven to twenty-one days, reducing ambient temperature from 38 to 40 degrees F down to 33 to 37 degrees F when carbon dioxide production falls off. If the reading is much less than one-third of the original hydrometer reading, the beer lacks slowly fermenting dextrins and should nearly ferment out in seven to ten days before the temperature is reduced for lagering.