Heck - you coulda not worried about them vac pumps and used it simply to dry farwood... 6 days @ 240° and you would have the best product around for sale and be able to command price/cord. Too, coulda offered local pallet companies Heat Treatment. Coulda, wooda, shoulda.
Gonna take some time. hopefully less, rather than more. Too hot around here to be sleeping in a kiln. Although sometimes I feel the house is about like a kiln