Centipedes can have a varying number of legs that range from as little as 30 legs to as many as 354 legs.
Most Centipedes are an average length of 1-1 1/2” long.
However some may get a bit longer than that but it's rare for them to be any longer than 1-1 1/2”.
I have seen a centipede while on a camping trip one time that as 2 foot long and I wish I had taken a picture of it but I didn't have my camera with me at the time.
Most centipedes have a lifespan of around 2 to 3 years however some centipedes can live as long as 5 and even 6 years.