La. Stat. tit. 13 § 5086
When any notice is issued and served as provided for in R.S. 13:5081 through 13:5090, ten full days exclusive of the day of service shall elapse before any witness so requested shall be compelled to appear and testify, or produce any books, papers or documents called for, but additional time beyond the ten days fixed herein shall be granted upon it being shown that a witness or books, papers or documents called for cannot be produced within such time. The commissioner may make orders extending the time for the production of particular books, papers and documents. If the taking of testimony shall not be concluded on the date named in the notice, the witness or witnesses shall remain in attendance from day to day until the same is completed or the witness is finally discharged by the court, or commissioner, as the case may be. Service of the notice and the return thereon may be made by any sheriff or constable, or by any disinterested person competent to make oath of the fact, and shall be made by the person executing the same, by delivering to the person or persons, attorney or attorneys to be served a true copy of such notice. Return of such service shall be endorsed on or attached to the original notice, which shall state when it was served and the manner of service, and upon whom served, and shall be signed, and if served by any person other than any officer, shall be sworn to by the party making the service before some officer authorized by law to take affidavits. Such affidavit shall be certified under the hand and official seal of such officer.
La. R.S. § 13:5086