The validity of the residence card shall not be affected by temporary absences not exceeding six months in a year, or by absences of a longer duration for compulsory military service or by one absence of a maximum of 12 consecutive months for important reasons such as pregnancy and childbirth, serious illness, study or vocational training, or a posting in another Member State or a third country.
3. Once acquired, the right of permanent residence shall be lost only through absence from the Republic of Cyprus for a period exceeding two consecutive years. http://www.moi.gov.cy/moi/crmd/crmd.nsf/All/D1D71A1CD6E43223C2257D2C00459524?OpenDocument