Okla. Stat. tit. 12, § 1806

During the period of the mediation, any applicable statute of limitation shall be tolled as to the participants. Such tolling shall commence on the date the parties agree in writing to participate in mediation and shall end on the date mediation is officially terminated by the mediator. A defendant in a criminal action shall be deemed to have waived his right to a speedy trial during the period of time he is participating in a mediation proceeding.