Looks Great Gary!!!
And a Good Test too !!--------
That would have been my guess---Cutting it in half will cut the time way down because of the thickness the heat has to get through, but it won't cut the time in half.
Just like when people ask if 3 equal butts will take 3 times as long as one, and some people say it will take the same time as one. That's not true---It will take longer to do three, but not much longer.
Great Job Gary!!