20-50 hours. A mere nanosecond in relation to audiophile time! :-)
Eagle, please know that I wasn't trying to "one-up" the Placette, on a cost basis. I've heard it is very good, also. Actually, the Bent CAN be had a bit cheaper in kit form, but because I have only recently reacquainted my hand with a soldering iron, I let it best to let John Chapman do the construction.