But they didn't seem to mind.
That's because the students, taking part in the almost 100-member Chapel Hill High School choral group, left Tuesday for New York to perform for an audience of millions at this year's Macy's Thanksgiving Day Parade.
And last Friday afternoon's rehearsal was just one of many that took a bite out of lunch break for both the students and choral director Ann Huff. "The kids are quick learners, and they'll get it right," she said. "But they're not ready yet."
The students were preparing to join about 700 members of high school choruses from across the United States at the parade, which will be broadcast nationally on NBC, Huff said.
The student choir will perform three numbers choreographed by renowned show choir choreographer John Jacobson, president of America Sings!, the nonprofit service organization that scheduled the performance.
"America Sings! sent us a videotape of John Jacobson doing the choreography so we could begin to teach the students beforehand," Huff said.
"It started out as only two lunches per week, but now it's every day," junior Hallie Zook said at Friday's rehearsal. "We have to be ready or they won't put us on the air."
The performance was not the only thing students prepared for Friday.
As part of the America Sings! Thanksgiving program, students also will support community service projects in New York by donating and preparing food for the needy.