The article deals with the problem of classifying interim decisions among those that are appealed in a shortened timeline, and determining the list of such decisions, as well as the closely related problem of determining the rules for calculating such a shortened timeline. Currently, the Criminal Procedure law provides for the possibility of appealing a number of interim decisions made at a pre-trial stage of criminal proceedings before the final decision Moreover, for appealing some interim decisions at a pre-trial stage of criminal proceedings, a general period of appeal is provided - 10 days from the date of the court decision, or the same period from the date of serving with a copy of the decision the person who is in custody, while for others a shortened timeline is 3 days from the date of the decision. Meanwhile, it follows from the literal interpretation of the Criminal Procedure Code of the Russian Federation that within a shortened three-day period, court decisions on the election of preventive measures in the form of a ban on certain actions, bail, house arrest, detention, the refusal to apply them or extend their application can be appealed. At the same time, such a conclusion is not confirmed either in the positions of the Plenum of the Supreme Court of the Russian Federation or in judicial practice. Based on the analysis of the criminal procedure law, the position of the Supreme and Constitutional Courts of the Russian Federation, scientific literature and practice, several problems are highlighted. Thus, the author states the discrepancy between the provisions of the Code of Criminal Procedure of the Russian Federation and the resolution of the Plenum of the Supreme Court of the Russian Federation when it comes to establishing the terms for appealing the court decision on a preventive measure in the form of bail. In addition, there is no single criterion for establishing shortened deadlines for appealing interim decisions, and there-fore, the list of such decisions requires analysis. In addition, the Criminal Procedure Code of the Russian Federation does not contain a norm that determines the rules for calculating daily terms. The author formulates several proposals for amendments. It is proposed to determine the criteria for a shortened appeal timeline as the restriction of the constitutional right to liberty and immunity of a person that requires the immediate judicial review of the lawfulness of such a decision. It is also necessary to correct the phrasing of Article 106 of the Criminal Procedure Code of the Russian Federation, which defines the procedure for applying a preventive measure in the form of bail, and establish the rule that appeal against such an interim court decision is filed according to the rules of Chapter 45.1 of the Criminal Procedure Code within ten days. The list of court decisions which must be appealed in a shortened timeline must be expanded by a court decision on putting a suspect or an accused into a medical organization providing medical or psychiatric care in hospital settings for forensic examination, as well as the extension of a person’s stay in a medical organization. In addition, the author has analyzed the approaches to the calculation of daily terms and proposes to amend Part 1 of Article 128 of the Criminal Procedure Code of the Russian Federation by establishing a single procedure for calculating daily terms, which does not take into account the day that served as a starting point of the term.