1. Why did Goku lose his tail?
2. Why did Goku’s tail never grow back?
3. How long can saiyans hold their breath?

Why did Goku lose his tail?

Gokus tail was cut off when he was still very young. It was cut it off By Kami to prevent him from transforming into an uncontrollable rampaging giant ape whenever the moon is out and full. They also destroyed the moon in case it wasn’t enough. Gokus tail was cut off when he was still very young.

Why did Goku’s tail never grow back?

Goku’s tail never grows back because, kami permanently removed it when he was training on the lookout, as he wanted to restore the Moon, but didn’t want the threat of an Oozaru(Great Ape) to be present. Or other reason could be that Master Toriyama either forgot, or simply decided to stop drawing tails anymore.

How long can saiyans hold their breath?

When Hit first shows this technique he can use it for 0.1 seconds. By the end of his fight with Goku it’s reached over 0.5 seconds.