Hey Doc,
My parents have one. It's about 15 years old now, 2-2.5 feet long and probably about 150lbs right now.
He was brought home when he was about 4 inches long and lived in a 100 gal aquarium for the first 5 years. Then we built him a shed in the back yard and he cruises the yard all day now.
Up front I would not recommend owning one unless you are really dedicated to tortoises especially African spurred tortoises. They get very large, are very strong, and can be very destructive.
At his current size he eats 2-3 heads of lettuce/greens a day + grazes on the lawn, really you should try to get a them on a diet of hay, but we started feeding him lettuce early on and were not able to get him to switch over. he seems to clip the grass instead of pulling it out when he is grazing so he doesn't damage the lawn but doesn't eat enough to affect the mowing schedule.
The one my parents have is pretty active, he roams the yard a lot, and is completely unaware of both his size and his surroundings. He has damaged all of the outside corners of their house as he will just bash into the corner and keep going. Planters and plant pots will get knocked over. At his current size he can climb into planters that are about 2 feet tall and will just walk through anything and everything. He destroyed my mom's entire rose garden this way. Depending on the individual some like to dig, a lot..... luckily the one my parents have is happy to spend his time above ground, most of the time (see pic below).
My parents had to switch out their patio set to a concrete one as it was not uncommon for him to walk under a chair, get it stuck on his shell and just keep going. It was entertaining when you are sitting on a couch in the living room and a chair just goes cruising past the window.
Keep in mind is that they do not hibernate so you need to provide heat for them year round. In his shed there is a heat lamp which keeps him warm at night and through the winter. The shed also has a door, that gets closed at night to make sure that predators can't get to him.
Read up on diet and shell pyramiding which is an issue with these guys. They live along time and there are not a lot a places that will be willing to take one off your hands so make sure you really want one.
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Propane tank in the background gives good idea of size, this picture is from 2 years ago, he is bigger now.
I don't want to sound too down on the ownership experience, he is interesting to have and watch and will interact with you a bit, especially for food. It's like having your own pet dinosaur. But if they had known what it was like to own a full size one, they wouldn't have picked up that cute little baby tortoise.