I completed Level 5, then chose to quit and claim rewards because one of my wolves had run out of health that round.
Edit: I completed Level 6.
Edit 2: I was defeated at Level 10.
I usually leave when one of my wolves passes out, but lately i've gotten up to lvl 8 (usually get up to 6-7)
I keep getting murdered on round 9. XP
I get to a max of three rounds before I get bored because it takes a bit.