Most of mine are 1-3 rounds at most. But I did have an epic against a pharaoh eddie with a fury grabber - It was golden son immunity v pharaohs immunity in a first to blink wins kinda game. Pretty sure that went a good 8 rounds or so. Lucked out with the timing on a stun to win it in the end
Thats what Im enjoying about PvP so far. The previous approaches to team selection are now so much broader, defence is more important, debuffs/buffs - so much more useful