Kostas was sentenced to 87 years in the Revolutionary Struggle case, but the sentence was merged into 50 years and 6 months. However, the maximum prison term is 25 years (which are typically served either as a full sentence or by day wages in prisons, or after the completion of 3/5 of the prison term, when a prisoner can be granted conditional release under specific conditions).

As of 05/01/15, Kostas was transfered to the 'special wing' in the basement of the womens’ section of Korydallos prison. In these special wings, mail may be intercepted and not reach the recipients.