Corona is 100% CPU, no GPU at all in rendering. The only time the GPU is used is if you use NVIDIA AI Denoising.
For rendering in batches, you would just render frames 1 to 5 because that finishes in under the 20 mins that overheats it. Then you give it 5 mins to cool down, and tell it to render frames 6 to 11, and so on. (This would mean tediously having to change the frame range being rendered and hitting rendering again, after the 5 min cooling off period, but hey, better than overheating your machine :) )