The general idea of 'waive' is that you are entitled to something but you choose to say that it is not necessary.
eg I charge $5 to enter my theatre, but you are my pal so for you I will waive the charge.
For your legal sentence, still more context is needed, but the idea may be this. You are entitled to spend a certain amout of time in doing something, perha
Given that all of my knowledge about criminal court proceedings comes from television, in the US, you have a Constitutionally guaranteed right to a "speedy trial." This can be a good thing if you are stuck in jail, waiting for your trial, and you feel confident that you will be aquitted.
However, if you need time to build your defense (and if you are out of jail on bail), you may want to
Thanks both for explaining the legalese. Clive explains from the viewpoint of common English speakers. Grammer Geek's explanation fits more into the original text, which discusses about the pro se criminal proceeding. Thanks a lot.