9 turns to capture one city that can be captured back instantly if you don't wait with a strong enough force really slow down conquest too much.
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Why capture when you can raze them in 2 turns and get tons of production, energy and cosmite ^_^ Shakarn scorched earth doctrine FTW
The time it takes to absorb a Colony is defined by the size of the Colony. A Colony with no additional Sectors will take 3 Turns to Absorb, as more sectors get annexed and the Colony develops the amount of turns it takes to absorb increases.
We were told that is was based on the number of sectors.
You just tried three different colonies, all with 3 sectors.
Why were you expecting any difference?