The phrase "a regular school day" is correct and usable in written English.
It can be used to describe a typical day of classes and activities at a school, without any special events or interruptions.
Example: "On a regular school day, students arrive at 8 AM and attend their classes until 3 PM."
Alternatives: "a typical school day" or "an ordinary school day".
"Our parking lots are already crowded with people coming and going on a regular school day, and this election is expected to have a record voter turnout".
It was a regular school day in the fall.
All interviews were conducted in a suitable room at the participating schools during a regular school day, with interviews lasting 20 minutes on average.
On a regular school day, Frankie tells us, we'd be called to the local public high school maybe three or four times for "disorderlies".
Summer feeding programs tend to be available for shorter and more irregular hours than a regular school day which limits participation.
Often these extracurricular activities will involve dance, photography, journalism, and other areas of interest that students may not have access in the course of a regular school day.
"I've only ridden him on a canter day and a regular schooling day but everything is in that nice rhythm and everything is effortless for him.
With a focus on part-time students, the school wanted a program that would afford students access to a foreign language course outside of the regular school day and one that could expedite study for students to earn credit through a shortened semester offering.
During their regular school day, students completed an anonymous self-report questionnaire with measures of study variables and demographic items.
All students were administered a pre- and post- assessment, in a proctored computer lab in each school, during the regular school day.
Students don't get enough of this in their regular school day in classrooms that might see a forty-students-to-one-teacher ratio.
