I overhaul the butler. I'll go there with a full invintory, and then send him. i'll start making a bench, get 1 bench in, and then he'll instantly refill that 7 (whatever) planks. Then i'll finish all that invintory, turn to the butler for another full invintory, finish that invintory and then get off the bench and send him for another invintory while I drop the benches i've made (all dropped by the time the butler gets back, which is like 5 seconds(?)) then I repeat it.
Overall not really any time lost, and probably time gained.