Longest fight ever...
...at least in my campaign.
An assault against a system of caves held by goblinoid rogues and rangers that turned into a protracted hit-and-run battle lasted for *twenty-nine* combat rounds... running, ducking, hiding, sniping, jockeying for position, bluffing, spellcasting, getting lost... it was fantastic! At least one attack die was rolled each round, so, that's a long battle! It came down to the wire, but the PCs won in the end and even managed to capture their at-the-time nemesis, a nasty female hobgoblin ranger with favoured enemy: human.
It was a blast!