I'd say 5-10 to get up to the 160+ region @ idle, I just take it easy until the engine is warm when I am driving...
You just want to make sure your operating temp is sufficient not your idle warmup time. Every car needs time for the oil to warmup, cooler or not... general public doesn't wait for their car to get to operating temp before driving.
The sandwhich plate will keep your flow lower until you reach 180. If your not reaching 180 under normal driving conditions that could signal that you have too big a cooler and need to make a block off plate since your not even getting the effectiveness of full flow.
I would bet that the extra qt to qt and a half is enough to already dissapate some of the heat before you even get to the cooler.
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