Mo. Rev. Stat. § 244.050

Within ten days after the filing of the commissioners' report the clerk of the circuit court shall give notice of such filing to each landowner, and said notice shall state the hour and date at which the circuit court, provided there be not less than five days between the serving of such notice and the date of hearing, will hear objections to said report. Any person whose land will be affected by the improvements as shown by said commissioners' report, shall have the right, on or before the date set for hearing of said report and before the hour set for said hearing, to file his objections to said report.