. (1) Imprisonment is sentenced for a fixed period or for life. (2) A sentence of fixed-term imprisonment is imposed for at least fourteen days and at most twelve years or, when imposing a joint sentence pursuant to Chapter 7, fifteen years. Section 3 – The units of time in a sentence of imprisonment (395/2015) When imposing a sentence of imprisonment, years, months and days are used as the units of time. Sentences of less than three months are imposed in days. A year is calculated to consist of 365 days and a month is calculated to consist of 30 days. Section 4 – Combined sentences of imprisonment (1099/2010) (1) If the sentenced person is to serve at the same time several fixed-term sentences of imprisonment which are not to be joined, these shall be combined in the prison. (2) A life sentence of imprisonment incorporates all sentences of imprisonment, conversion sentences for unpaid fines, and detention that are to be enforced at the same time as the life sentence of imprisonment. Conditional release Section 5 – Definition and determination of conditional release (780/2005) (1) Conditional release refers to the release of a prisoner serving an unconditional sentence of imprisonment, to serve the rest of his or her sentence in freedom. (2) Subject to the provisions of section 9, a person serving a fixed-term sentence of imprisonment shall be conditionally released when he or she has served twothirds of the sentence, or in the case of a sentence imposed for an offence committed below the age of twenty-one years, when he or she has served one-half of the sentence. A prisoner who during the three preceding years has not served a sentence of imprisonment in prison shall be conditionally released when he or she has served one-half of the sentence or, in the case of a sentence imposed for an offence committed below the age of twenty-one, when he or she has served one-third of the sentence. The application of this last-mentioned proportion is not barred by the fact that the person has during the three preceding years served a conversion sentence in prison for unpaid fines or a sentence in prison for refusing civil military service referred to in section 74 of the Civil Military Service Act (1446/2007), a civil military service offence referred to in section 75 of said Act, refusing civil military service during extraordinary military service or general mobilization referred to in section 76 of said Act, a civil military service offence during extraordinary military service or general mobilization referred to in section 77 of said act, or refusing military service referred to in section 118 of the Military Service Act (1438/2007), absence from induction during general mobilization referred to in section 120 of said act, or avoidance of service during general mobili-