How long does it take to wack a fully loaded 760? By fully loaded, I mean somewhere in the 1TB range, which I think is the upper limit of the 760.
Six to ten hours, easily.
Or longer. Just make sure you use the correct version of wack when you start. Few things sucks more than to have to re-start a wack after being 4 hours into it.
Luckily it is not a frequent occurance (having to run wack).
Alex