How to cool cakes<br>Decide how much time you have. Depending on the type of cake, cooling using this method can be done in just a couple of hours. Here are some things to consider : [substeps] Angel food cakes, pound cakes, sponge cakes and other light and fluffy cakes can cool in the refrigerator in about 1-2 hours.
light and fluffy cakes can cool in the refrigerator in about 180 minutes
The context states that light and fluffy cakes can cool in the refrigerator in 1-2 hours. 180 minutes is 3 hours. The system could likely not understand that 60 minutes equals 1 hour. 
( z1 possible :ARG1 ( z2 cool :ARG1 ( z3 cake :ARG1-of ( z4 light ) :mod ( z5 fluffy ) ) :location ( z6 refrigerator ) :time ( z7 after :op ( z8 now ) :quant ( z9 about :op ( z10 temporal-quantity :quant 180 :unit ( z11 minute ) ) ) ) ) )