How could it possibly be the longest? 
Oh, and just so you know, that *might* not work, as it doesn't follow USB specifications. The mini-A/B plugs have an additional "pin" that doesn't exist on the regular A/B plugs, and as you are converting from mini to regular back to mini, you lose that additional pin (which controls which device functions as the host, and which as the client - necessary for calc<->calc transfers)
Oh, and just so you know, that *might* not work, as it doesn't follow USB specifications. The mini-A/B plugs have an additional "pin" that doesn't exist on the regular A/B plugs, and as you are converting from mini to regular back to mini, you lose that additional pin (which controls which device functions as the host, and which as the client - necessary for calc<->calc transfers)
