Grasa, the air layers were started Sept 3 and the first batch were potted 4 weeks later. Different varieties grow roots at different rates. I found Nero, Sicilian Red, Sal's C, Atreano, LSU Gold to be really fast and vigorous. Slower rooters were LSU Purple, Vista, Scott's Black and a few others. The slowest were were Sal's EL, Hardy Chicago, Beall, Alma, VDB amd some others.
Here is an LSU Purple I potted a few days ago.