It is a realtime datapoint and is determined by the polling interval set within the Data Logging screen.  FYI - Archives contain 156 data points.  With 10-minute polling intervals defined, you will have a 26 hour archive period.  156 data points x 10-min (intervals) =1560 min divided by 60 minutes = 26 hours.  A  2-minute polling interval would give you an approx. 5.2 hour archive of performance data.
Hello,  How do Navisphere Analyzer logg performence metrics. Is it a minimum, maximum or an average value from the last sample, or is it the "real" vaule in that point in time when analyzer writes its log?  Tia Henrik
Navisphere analyzer - datalogging