Ohio Rev. Code § 727.11
Special assessments for any improvement under this chapter shall be payable in annual installments pursuant to one or more payment schedules authorized by the legislative authority in the resolution of necessity adopted pursuant to section 727.12 of the Revised Code. Except as otherwise provided in section 727.251 of the Revised Code, the number of annual installments of any assessment for street lighting purposes or to pay the costs of relocating overhead wires, cables, and appurtenant equipment underground shall not exceed thirty and the number of annual installments of all other assessments shall not exceed the maximum maturity for which securities could be issued in anticipation thereof under Chapter 133. of the Revised Code. If no period of maximum maturity is so specified, then the period for which such other assessments shall be levied, except as otherwise provided under section 727.251 of the Revised Code, shall not be less than one year, but may not exceed the estimated life of the usefullness of the improvement as certified by the fiscal officer of the municipal corporation.
R.C. §727.11