The tally on the Prairie Grove Teachers Association website reads 575.
It represents the number of days instructors have been working without a signed contract agreement with the Board of Education.
The PGTA on Sunday issued an e-mail stating that 93-percent of its membership on Aug. 21 overwhelmingly approved a strike authorization vote.
"After meeting for five hours on Aug. 21, 2012, Prairie Grove Teachers Association was yet again disppointed in the negotiations session," the email stated.
The PGTA further stated no decision has been made on "a strike date at this time."
For the past 20 months, the PGTA and District 46 Board of Education have been negotiating terms for a new contract to no avail. The district, based at 3223 Route 176 in Crystal Lake, serves approximately 900 students in kindergarten through eighth grade.
In January, the PGTA sought assistance from a federal mediator, and still no resolution was reached. On May 3, the PGTA declared an impasse. , according to a Crystal Lake-Cary Patch article.