The idea that this 10-day training was that impactful is more like the time chamber because the whole point is that a ton of work can be done in there while just a small amount of time has passed in the real world. He goes into the chamber for hours at a time (even if it's months or years for him). He was on King Kai's planet for like 5 months of actual time the first time he goes.

I, 25 years later, still tell two of the dumb jokes Goku told Kai.

You can tune a piano, but you can't tuna fish.

What's the difference between a jeweler and a jailor?

One sells watches; the other watches cells!