BULGARIA - PENAL PROCEDURE CODE
Part one. GENERAL RULES
Chapter seven. ACCUSED
Section II. Restraining Measure and Other Measures of Procedural Compulsion
Art. 63. (4) The detention in custody in the pre-trial proceeding shall not last for more than one year, if the charge is for a major malicious crime and for more than two years, if the charge is for a crime for which a punishment of not less than fifteen years of imprisonment or life imprisonment is provided. In all the rest of the cases, the detention in custody in the pre-trial proceeding shall not last for more than two months.
Fair trial standards
Rights during investigation - arbitrary arrest or detention and deprivation of liberty
EDIT.