Instructional day does not include a day that falls after the last instructional day of the spring term and before the first instructional day of the subsequent fall term.
See TEC § 29.004(1)
See 19 TAC §§ 89.1011(c)(1) and (g)
See FFY 2020-2025 Part B Indicator Measurement Table https://sites.ed.gov/idea/files/1820-0624_FFY20Part_B_SPPAPR_Measurement_TableFINAL.pdf