101. The total number of days on which overtime may be permitted in any enterprise, establishment or institution must not exceed 50 days per annum, including such days when only one wage earner worked overtime. 102. Every enterprise, establishment or institution must keep a special record book for overtime work. 103. All wage earners must be allowed a weekly uninterrupted rest of not less than 42 hours. 104. No work shall be done on specially designated holidays. _Note._ Rules concerning holidays and days of weekly rest are appended hereto. 105. On the eve of rest days the normal working day shall be reduced by two hours. _Note._ This section shall not apply to institutions and enterprises where the working day does not exceed six hours. 106. Every wage earner who has worked without interruption not less than six months shall be entitled to leave of absence for two weeks, irrespective of whether he worked in only one or in several enterprises, establishments or institutions. 107. Every wage earner who has worked without interruption not less than a year shall be entitled to leave of absence for one month, irrespective of whether he worked in only one or in several enterprises, establishments or institutions. _Note._ Sections 106 and 107 shall take effect beginning January 1, 1919. 108. Leave of absence may be granted during the whole year, provided that the same does not interfere with the normal course of work in enterprise, establishment or institution. 109. The time and order in which leave of absence may be granted shall be determined by agreement between the management of enterprise, establishment or institution and proper self-government bodies of the wage earners (works and other committees). 110. A wage earner shall not be allowed to work for remuneration during his leave of absence. 111. The remuneration of a wage earner earned during his leave of absence shall be deducted from his regular wages. 112. The absence of a wage earner from work caused by special circumstances and permitted by the manager shall not be counted as leave of absence; the wage earner shall not be paid for the working hours lost in such cases. ARTICLE VIII METHODS TO ASSURE EFFICIENCY OF LABOR 113. In order to assure efficiency of labor, every wage earner working in an enterprise, establishment or institution (governmental, public or private) employing labor in the form of organized collaboration, as well as the administration of the enterprise, establishment or institution, shall strictly observe the rules of this article of the Code relative to standards of efficiency, output and rules of internal management. 114. Every wage earner must during a normal working day and under normal working conditions perform the standard amount of work fixed for the category and group in which he is enrolled. _Note._ Normal conditions referred to in this section, shall mean: