SINCLAIRVILLE — Cassadaga Valley is increasing hours for its students to be in the school buildings. On Thursday, Superintendent Chuck Leichner announced the change in a Facebook post and in a letter posted on the school’s website. “We are excited to start the return of increased in-person attendance for more students. As a result of class sizes and staffing capacity, we must (at this point) have a variety of return schedules. While there will be more detailed information available soon, below is the outline of student return by grade level,” he stated According to Leicher, the changes are as follows: