diff --git a/qt-ui/profile/divecartesianaxis.cpp b/qt-ui/profile/divecartesianaxis.cpp
index 7a58e3bb4..5b7f9cfad 100644
--- a/qt-ui/profile/divecartesianaxis.cpp
+++ b/qt-ui/profile/divecartesianaxis.cpp
@@ -71,6 +71,7 @@ void DiveCartesianAxis::updateTicks()
 	}
 	if (steps < 1)
 		return;
+
 	if (!labels.isEmpty() && labels.size() > steps) {
 		while (labels.size() > steps) {
 				DiveTextItem *removedText = labels.takeLast();
@@ -102,12 +103,14 @@ void DiveCartesianAxis::updateTicks()
 		} else {
 			childPos = begin - i * stepSize;
 		}
+
 		labels[i]->setText(textForValue(currValue));
 		if ( orientation == LeftToRight || orientation == RightToLeft) {
 			labels[i]->animateMoveTo(childPos, m.y1() + tickSize);
 		} else {
 			labels[i]->animateMoveTo(m.x1() - tickSize, childPos);
 		}
+		labels[i]->setVisible( i % 2 );
 	}
 
 	// Add's the rest of the needed Ticks / Text.
@@ -121,9 +124,6 @@ void DiveCartesianAxis::updateTicks()
 		DiveTextItem *label = NULL;
 
 		if (showText){
-			QString text = textForValue(currValue);
-			if(text.isEmpty())
-				continue; // Do not create or do anything with an empty string.
 			label = new DiveTextItem(this);
 			label->setText(textForValue(currValue));
 			label->setBrush(QBrush(textColor));
@@ -143,6 +143,7 @@ void DiveCartesianAxis::updateTicks()
 				label->animateMoveTo(m.x1() - tickSize, childPos);
 			}
 		}
+		label->setVisible( i % 2 );
 	}
 }
 
@@ -283,7 +284,10 @@ QColor TimeAxis::colorForValue(double value)
 
 QString TimeAxis::textForValue(double value)
 {
-	return QString::number(value / 60);
+	int nr = value / 60;
+	if (maximum() < 600 )
+		return QString("%1:%2").arg(nr).arg( (int)value%60, 2, 10, QChar('0'));
+	return  QString::number(nr);
 }
 
 QString TemperatureAxis::textForValue(double value)
diff --git a/qt-ui/profile/divetextitem.cpp b/qt-ui/profile/divetextitem.cpp
index 163bb64f4..72ba480a9 100644
--- a/qt-ui/profile/divetextitem.cpp
+++ b/qt-ui/profile/divetextitem.cpp
@@ -42,11 +42,13 @@ const QString& DiveTextItem::text()
 
 void DiveTextItem::updateText()
 {
-	if(internalText.isEmpty())
-		return;
-
 	delete textItem;
+	textItem = NULL;
 	delete textBackgroundItem;
+	textBackgroundItem = NULL;
+	if(internalText.isEmpty()){
+		return;
+	}
 
 	QFont fnt(qApp->font());
 	QFontMetrics fm(fnt);
diff --git a/qt-ui/profile/profilewidget2.cpp b/qt-ui/profile/profilewidget2.cpp
index 007ca8a68..3a65fdd66 100644
--- a/qt-ui/profile/profilewidget2.cpp
+++ b/qt-ui/profile/profilewidget2.cpp
@@ -387,6 +387,23 @@ void ProfileWidget2::plotDives(QList<dive*> dives)
 	temperatureAxis->setMinimum(pInfo.mintemp);
 	temperatureAxis->setMaximum(pInfo.maxtemp);
 	timeAxis->setMaximum(maxtime);
+
+	int i, incr;
+	static int increments[8] = { 10, 20, 30, 60, 5*60, 10*60, 15*60, 30*60 };
+	/* Time markers: at most every 10 seconds, but no more than 12 markers.
+	 * We start out with 10 seconds and increment up to 30 minutes,
+	 * depending on the dive time.
+	 * This allows for 6h dives - enough (I hope) for even the craziest
+	 * divers - but just in case, for those 8h depth-record-breaking dives,
+	 * we double the interval if this still doesn't get us to 12 or fewer
+	 * time markers */
+	i = 0;
+	while (i < 7 && maxtime / increments[i] > 12)
+		i++;
+	incr = increments[i];
+	while (maxtime / incr > 12)
+		incr *= 2;
+	timeAxis->setTickInterval(incr);
 	timeAxis->updateTicks();
 	cylinderPressureAxis->setMinimum(pInfo.minpressure);
 	cylinderPressureAxis->setMaximum(pInfo.maxpressure);