The working parameters of an SEM/EDS instrument should be studied and optimized for each instrument's and laboratory's needs [12,13]. Differences in laboratories across countries and different sample types can cause significant variability in results and should be taken into account when interpreting shooting events [4,14]. In a recently published review, [PERSON] et al. discussed the findings on the distribution, deposition, transfer, and persistence of GSR [3]. Although it has already been studied in depth [3,4,15,16], the possibilities of establishing or, at least, supposing the elapsed time between firearm discharge by a suspect and GSR sampling requires a specific study for each particular country, criminal case, and firearm. The persistence of GSR on a shooter's hands, nose, hair, or clothing is strongly influenced by the person's activity, the substrate being tested, the skin conditions, the firearm and ammunition type, the number of shots, and the outdoor or indoor conditions as well as the collection and analysis techniques [3,17]. The total number of detected particles has been reported to vary significantly, even within the ammunition itself [18]. The GSR collected from the face, hair, and clothing of a shooter showed a longer half-life than the samples taken from the person's hands [18]. A decrease in the amount of characteristic GSR collected from a shooter's hands one hour postdischarge was well-described [19]. However, secondary transfer or the shooter's behavior at the crime scene greatly affected the obtained results [4,16,20]. Generally, the characteristic GSR particles may still be detected by SEM/EDS on a shooter's hands between 4 and 10 h after firearm discharge and normal office activity [3]. Several forensic protocols recommend GSR sampling, depending on the time following the criminal event. When GSR sampling is performed later than 4 h after a shooting event, samples collected from a suspect's face, hair, and clothing should be included in the evidential material along with hand samples due to the loss of GSR particles [18]. The comparison of published data is a complicated task, and enlarging the database of available results may benefit forensic scientists from each country. In the Republic of Kosovo, the ASTM 1588 classification is applied for characteristic inorganic GSR particles investigated by SEM/EDS, and it is accepted in court as evidence. Our recently published study demonstrated the results from SEM/EDS optimization and method validation by the Kosovo Forensic Agency [12]. The uncertainty of the number of particles found by the optimized SEM/EDS method is estimated to be 6%, and it should be taken into account in the conclusions based on the number of detected particles. In Kosovo, the GSR testing of a suspect is currently performed regardless of the time after a shooting event. It is important to study the appropriate time interval between firearm discharge and GSR sampling, taking into account the specificity of normal office activity in the Republic of Kosovo as well as the specificity of the firearms used by criminals in this region. This study is aimed at exploring the number of characteristic GSR particles identified by SEM/EDS as a function of time, gun caliber, number of shots, and weather conditions. The obtained data would allow, on one hand, a broadening of the information extracted from SEM-EDS measurements and, on the other hand, the establishment of the time interval after shooting that is appropriate for GSR sampling. Different firearms typically used in criminal cases in Kosovo were studied, and the experiments were conducted outdoors in the summer and winter seasons to determine the influence of weather conditions. Nine people participated in the experiments in order to determine the influence of specific human skin conditions on the results, and the participating shooters followed a common office routine.