By the way, this is an extract kit from AHS, so I assume the grains they are asking to soak are for flavor and/or color, right?
Okay, here's exactly what the recipe calls for.
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In a 20 quart pot, bring 2.5 gallons of water to 155ºF and turn off heat.
Put the crushed grains in the grain bag:
.5 lb. White Wheat Malt
.5 lb. 2-Row
Soak the grain in the hot water for 15 minutes. Lift the grain bag in and out of the water like a teabag. After soaking the grains, lift the grain bag out of the water. Once the bag has dripped almost all the water out, discard the grains and return the heat until boiling.
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Then, add the LME and off you go on a normal brew process for extract. So, is 15 minutes on the mark to get the flavor and color out of the grains?