THe question isn't so much the space, probably a year or more, but I like to see a 20 or 22 inch high cage with lots of stacked flag stone, shale or rocks of some type, and for one animal I would say 36" long is adequate but I would definately have the depth of the cage to be 22 to 24 inches wide. Tis gives plenty of run around room, probably want a Mercury vapor light shining down 160 watt and pssibly a 75 watt Zoomed bulb in the middle. The idea is to create an ambient temp on one side of 105-110 and 85 or so on the cool side of the cage so the animal can thermo regulate. It can be raisd on high grade astro turf which can be taken out and sprayed down every once in awhile..or home depot playsand, when they are young you can feed them occasional insects (wax worms, King mealworms, crickets) but for the most part veggies, including dandilion, rose pedals and hibiscus if you have any around your house that has not been sprayed with pesicides. THey live yellow mustard flowers as well. Be sure that your rock stacks are glued together with silicon or something similar so they won't fall on your lizard ro come apart and hurt him.her. Good luck....
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