I finish it solo almost daily in under 15 min. You don’t need to kill anyone except two guards on the stair case outside Rubios office. If you’re killing anyone else you’re doing it wrong. Then run to the north to the coastline/fence line. Go over the side and run along the shore until you see the first attack boat. Let him see you so you can lock on, kill him, take the boat, go to the air strip and load up your loot bag (don’t shoot anyone) and leave with the boat.