In this graduation thesis we have checked the quality of RTK-point positioning in the coordinate system ETRS89 with various occupation durations. The occupation durations were related to the interval from 5 seconds and up to 5 minutes after the successful initialization. The process of identifying differences has been performed similar to the methodology of RTK-instrument testing according to the standard ISO17123-8. First we have established a three-point network at the area of Trbovlje and further performed static GNSS measurements. By several different post-processing strategies we have acquired coordinates that were used as the reference for further studies. We have used observations from three permanent stations of the national continuously operating reference station network SIGNAL, i.e. Trebnje, Celje, Ljubljana and finally also VRS station to acquire final coordinates from post-processing. Meanwhile we have tried to find out the minimal occupation duration for quality baseline determination from fast-static measurements. Positions of the three points were determined using Leica 900 instrument for RTK-method performance. Positions were determined by several independent initializations and by different occupation durations. We have found that in the case of the instrument Leica 900 there are no significant differences between positions of detail points, acquired from different occupation durations after the initialization.