How long to defrost 11 1bs. of chicken in the fridge?
To a first approximation, heat exchange occurs on the surface of an object, and then the heat must conduct through the object. So, again, continuing the approximation, the time for something to heat (or cool) completely depends on how thick it is.

Other things that matter a good deal are: the temperature difference (the colder your fridge, the longer it'll take); the amount of airflow (moving = faster); and finally how fast the air gives up heat. (You can't change how fast the air does, but you can defrost under cold running water instead, water gives up heat much better than air).

How cold your freezer is doesn't actually matter that much. This is because water's transition from solid to liquid actually takes a lot of energy; it dwarfs any difference from a -5F freezer v. a +5F freezer. (Also why ice cools so well.)

So, if you have frozen them in a thin layer, and your fridge is close to 40F (the hottest it should be, for safety reasons), it'll defrost fairly quickly. Probably within an hour or two.

If you have a 11 lb block of chicken, it'll take a long time, I'd suggest looking up turkey defrosting times for comparison. 11 lb block of chicken in a 34F fridge would take days.

Remember that since defrosting in the fridge keeps the kebobs out of the "danger zone" for the entire time, you can safely hold the defrosted kebobs in the fridge for a day or two. So if they defrost a day before you need them, it's not a problem.