A classroom teacher, defined in Section 5.001 of the Education Code as an educator who teaches an    
  average of four hours a day, is entitled to 450 minutes in each two-week period for planning and in
  blocks of not less than 45 minutes. Educators who teach less than an average of four hours a day are
  not entitled to a planning and preparation period underSection 21.404 of the Education Code.
  Planning and preparation periods are typically 45 minutes every day or 90 minutes every other day.

  Teachers are also mandated to receive a thirty minute duty-free lunch.