Dalek Sec is a human-Dalek hybrid that the Doctor faced in New York during the great depression. He was created because the Daleks felt they needed to evolve in order to survive. They practiced the genetic fusion on humans and pigs to make pig slaves, but the pig slaves were unstable, and had a very short lifespan.
Eventually, Dalek Sec gets killed by the other Daleks, but if they hadn’t killed him, how long would he have survived? Is there any canon information about this?