Limit min number of collected stats

mtglib/internal/doppel/ganger.go

 			return
 		case durations := <-currentScoutCollectedChan:
 			g.durations = append(g.durations, durations...)
+
 			if len(g.durations) > DoppelGangerMaxDurations {
 				g.durations = g.durations[len(g.durations)-DoppelGangerMaxDurations:]
 			}
 
+			if len(g.durations) < MinDurationsToCalculate {
+				continue
+			}
+
 			currentScoutCollectedChan = nil
 			g.wg.Go(func() {
 				select {