Now I'm no Kingsnake expert or anything so there might be different answers out there :p

Looking at my records.
Here is a female I picked up on 07-13-12 Not sure of her age.
07-27 84g
09-30 127g
11-03 174g
12-08 184g

Eating 2 rat pinks a week


Male - obtained 08-04-12 / 2012 hatch date.
08-04 14g
09-30 14g
11-03 16g
12-08 23g
2- mice pinks a week