diff --git a/Software/PC_Application/LibreVNA-GUI/VNA/vna.cpp b/Software/PC_Application/LibreVNA-GUI/VNA/vna.cpp
index 30abb11..8533a2c 100644
--- a/Software/PC_Application/LibreVNA-GUI/VNA/vna.cpp
+++ b/Software/PC_Application/LibreVNA-GUI/VNA/vna.cpp
@@ -52,6 +52,7 @@
 #include <QStyle>
 #include <QScrollArea>
 #include <QStandardItemModel>
+#include <QDateTime>
 
 VNA::VNA(AppWindow *window, QString name)
     : Mode(window, name, "VNA"),
@@ -843,6 +844,16 @@ void VNA::NewDatapoint(DeviceDriver::VNAMeasurement m)
         return;
     }
 
+    // Calculate sweep time
+    if(m.pointNum == 0) {
+        // new sweep started
+        static auto lastStart = QDateTime::currentDateTimeUtc();
+        auto now = QDateTime::currentDateTimeUtc();
+        auto sweepTime = lastStart.msecsTo(now);
+        lastStart = now;
+        qDebug() << "Sweep took"<<sweepTime<<"milliseconds";
+    }
+
     if(singleSweep && average.getLevel() == averages) {
         Stop();
     }