Interesting question....

[Tamsin]

If a person is dead, can he go to the normal world for a certain amount of time? In the series, Goku was allowed to return to the normal world for a short period of time so he could participate in the tourney.

[Tamsin]

Damn......I guess theres just no way I can go to the world of the living for a period of time unless im in hell. Oh well.....im off to countinue my training.