They get around 5-6inches long. My w.c male is huge! A good range in temp is 68-74 during the day with a modest drop at night. I haven't purposely gone over 76 but in the summer time it was difficult to keep them really cool. Frequent misting and a fan helped but sometimes their temp went to 78 with a ground temp of 74.
Neil told me as long as they have a 10 degree drop at night they'll be fine. They like very high humidity between 60-90% depending on the last time they have been misted. The air is so dry during winter so I started giving them time in a delicup full of moist cocobark to hydrate. I keep them by a drafty window. Their tanks at night drop into the 50's and they are still very active. They love to chow down several small crickets every other night. Their necks are very thin so no large prey items.
My female is very fat and my two males are slender but very active. I dust their crickets with leopard gecko icb, sometimes I sprinkle them with cgd for a change. I sprinkle extra calcium on their ficus leaves and sometimes they'll lick it off my finger. One thing I find very cool is when they receive calcium of my finger in a couple minutes their colours get really intense. I have found the same result after feeding them small snails I collected. It must make them happy