Half of the teacher-researchers’ standard working time is made up of teaching services determined in relation to standard annual time equal to 128 class hours, or 192 hours of guided studies or practical classes or any equivalent combination in initial, continuing or distance education; the other half is made up of research activities. The service of a teacher-researcher can be adjusted, subject to his/her approval, so as to include a number of teaching hours less or greater than 128 hours of class, or 192 hours of guided studies. This service adjustment cannot however result in a teaching service of less than 42 hours of lectures or 164 hours of guided studies or practical classes. It must also leave each teacher-researcher with significant time for his/her research activities. Teacher-researchers, like all State civil servants, have the same holiday time, as described in Article 34 of Law no.84-16 of 11 January 1984, including annual holidays, maternity leave, adoption leave, etc.