Around the Cell saga, when Goku and Gohan are training in the hyperbolic time chamber, Goku tells Gohan that as a child, he was only able to stay in the chamber for a month, even though we've learned previously that the gravity in there is ten-fold greater than that on Earth. Goku being able to survive in the chamber seem unlikely, as he struggles greatly with the same gravity on Kaio-sama's planet as an adult.