Before I found one prince, I found 3 southern hive soldiers and 1 southern hive drone. 3-4 hours of repeated imports with a person stationed at each slave camp in the north. Takes 3ish minutes per cycle so 80 imports as a rough estimate.
Allied to the crab raiders. Saw crab tournament on the upcoming events, but nothing triggered when the timer hit 0... until several days later, I noticed a green dot on the map on the skinhouse HQ. I sent someone to investigate, and as you may guess, the crab tournament had triggered there. The crabs didn't last long. I did notice though, the tournament advanced in progress. Could this mean the crab raiders could ally with the skin bandits?