It was in the primary for 8 days. My instructions said 4-6, but I'm thinking next time even longer? I didn't manage to get a reading on it as I only figured out what the clamp on the syphon hose was for afterwards when I was cleaning up. :P I put what was left in the syphon into my hydrometer's test tube, but it wasn't enough for it to float. It was enough to be tasty, though.