Max losses about 211R, takes about 30 minutes from clicking Start to clicking Complete (looter dependent)
P.S. Yes I do know you can save about 100 or so of those recruits by doing it slowly one camp at a time.
If you do not have Major General and want to do it with Veteran General instead, just replace the shown 11r 1e 258c with:
Veteran General: 16r 1e 233c
Losses: 7-12r on Intercept 1-1, 3r on Intercept 1-2, upto 2r (just 1r if only 1r left) on main camp (Attack #1)