The time at which a school opens: as, nine o'clock is school-time.(noun)
The time in life passed at school.(noun)
The Century Dictionary (Public Domain)
Use "school-time" in a sentence
"We are also resetting ourselves for the school-time routine and that takes a bit to adjust to after a summer of sleeping in and staying up late."
"Yeah, this right, this problem very actually rather in Republic of Kazakhstan, when the 11th graduated students prepare their to ENT Edinyi National Test, this same to EGE and all students in high-schools spent their all free-time and school-time only for learning test without logic and thinking how this bad."
"The school-time data come from the Education Department, which relied on information from the group that administers TIMSS."