ROMEOVILLE, Ill. (WLS) -- Teachers in the Valley View School District are a step closer to walking off the job.

The district covers Romeoville and Bolingbrook The teachers union there filed an official notice of their intent to strike.

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The teachers and the district are arguing about an additional 20 minutes being added to the school day .

District officials say the extra instructional time will lead to higher test scores. Teachers say it puts unnecessary burdens on staff.

The earliest teachers can strike is Sept. 15.

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