Tegus get big, 4ft long for smaller reds, and larger(these are hybrids so I'm not sure).
And it's a bulky 4 ft min. So they need a 8ft long cage, plus a high temp basking spot. Mine enjoy a 8x8ft outdoor cage, plus a roomy indoor cage. But they don't poo in the water dish the way the monitors do(at least mine don't).