diff --git a/Graphs/gSummaryChart.cpp b/Graphs/gSummaryChart.cpp
index 9429dd15..9a348872 100644
--- a/Graphs/gSummaryChart.cpp
+++ b/Graphs/gSummaryChart.cpp
@@ -22,6 +22,7 @@ SummaryChart::SummaryChart(Profile *p,QString label,GraphType type)
     lines->forceAntiAlias(false);
     m_empty=true;
     hl_day=-1;
+    m_machinetype=MT_CPAP;
 }
 SummaryChart::~SummaryChart()
 {
@@ -69,6 +70,7 @@ void SummaryChart::SetDay(Day * nullday)
             type=m_type[j];
             for (int i=0;i<d.value().size();i++) {
                 day=d.value()[i];
+                if (day->machine_type()!=m_machinetype) continue;
                 if (type==ST_HOURS || day->channelExists(code) || day->settingExists(code)) { // too many lookups happening here.. stop the crap..
                     m_days[dn]=day;
                     switch(m_type[j]) {
diff --git a/Graphs/gSummaryChart.h b/Graphs/gSummaryChart.h
index 21277bcd..fc5b4fcf 100644
--- a/Graphs/gSummaryChart.h
+++ b/Graphs/gSummaryChart.h
@@ -25,6 +25,8 @@ class SummaryChart:public Layer
         virtual bool isEmpty() { return m_empty; }
         void addSlice(ChannelID code, QColor color, SummaryType type) { m_codes.push_back(code); m_colors.push_back(color); m_type.push_back(type); }
         void deselect() { hl_day=-1; }
+        void setMachineType(MachineType type) { m_machinetype=type; }
+        MachineType machineType() { return m_machinetype; }
     protected:
         Qt::Orientation m_orientation;
 
@@ -49,6 +51,7 @@ class SummaryChart:public Layer
         int hl_day;
         gGraph * graph;
         GraphType m_graphtype;
+        MachineType m_machinetype;
         virtual bool mouseMoveEvent(QMouseEvent * event);
         virtual bool mousePressEvent(QMouseEvent * event);
         virtual bool mouseReleaseEvent(QMouseEvent * event);
diff --git a/SleepLib/day.h b/SleepLib/day.h
index 617535cc..e2349e8b 100644
--- a/SleepLib/day.h
+++ b/SleepLib/day.h
@@ -55,7 +55,7 @@ public:
 
 
     qint64 total_time(); // in milliseconds
-    EventDataType hours() { return EventDataType(double(total_time())/3600000.0); }
+    EventDataType hours() { return double(total_time())/3600000.0; }
 
     Session *operator [](int i) { return sessions[i]; }