Русско-англо-русский юридический словарь

A business day is considered every official working day of the week. Another common term is working day. Typically, these are the days between and including Monday to Friday and do not include public holidays and weekends. (Wikipedia)

Corrections that have been requested shall be considered approved unless the President is of the opinion that they are sufficiently important to be submitted to the representatives on the Security Council. In the latter case, the representatives on the Security Council shall submit within two working days any comments they may wish to make. In the absence of objections in this period of time, the record shall be corrected as requested. (Provisional Rules of Procedure, United Nations Security Council)

The Appointee shall carry out his duties hereunder between the hours of 9:15 am and 5:30 pm on normal working days and during such other hours as may from time to time he necessary in order to fulfill properly his duties hereunder and he shall not be entitled to extra remuneration for work performed outside normal working hours. (Service Agreement - TMP Worldwide Ltd. and Peter Dolphin)

The roads were choked with vehicles at the time as government employees were leaving their offices due to a shortened working day during Ramadan. (Express)