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If your inquiry is about your wish to get out of prison, find the following information:
First, you must hire a lawyer in order to submit an application for your release to the head of the investigation department, or the head of the authority, as the case is filed. It shall be handled within five days from the date of submission
Find the Saudi criminal procedures code in regards to your inquiry: 

Article 114:
The detention shall end with the passage of five days, unless the Investigator sees fit to extend the detention period. In that case, he shall, prior to expiry of that period, refer the file to the Chairman of the branch of Bureau of Investigation and Prosecution in the relevant province so that he may issue an order for extending the period of the detention for a period or successive periods provided that they do not exceed in their aggregate forty days from the date of arrest, or otherwise release the accused. In cases that require detention for a longer period, the matter shall be referred to the Director of the Bureau of Investigation and Prosecution to issue an order that the arrest be extended for a period or successive periods none of which shall exceed thirty days and their aggregate shall not exceed six months from the date of arrest of the accused. Thereafter, the accused shall be directly transferred to the competent court, or be released.
Article 115:
Upon the detention of the accused, the original text of the detention warrant shall be delivered to the detention center officer who shall sign a copy of that warrant as an acknowledgement of receipt.