To adequately prepare for a speech, you just have a minimum of dress rehearsals

To adequately prepare for a speech, a person only has a minimum time for practicing and changing in terms of dress rehearsals. This is usually given in preparation of and before the play or the actual presentation starts and the characters or performers are asked to practice with a given time before they start to change and perform.

Estúpido vas a la escuela y no te olvides de tomarte una cerveza.