diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3a1ff16aa..f5647f26c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -350,7 +350,7 @@ endif()
 #
 # Google Test
 #
-if(NOT EXISTS "${PROJECT_SOURCE_DIR}/ext/googletest/CMakeLists.txt")
+if(BUILD_TESTS AND NOT EXISTS "${PROJECT_SOURCE_DIR}/ext/googletest/CMakeLists.txt")
   message(FATAL_ERROR "The submodules were not downloaded! GIT_SUBMODULE was turned off or failed. Please update submodules and try again.")
 endif()
 
diff --git a/ChangeLog b/ChangeLog
index 250594b47..84e1e6aef 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -14,6 +14,7 @@ Bug fixes:
 - #6817 Configure requires dns_sd.h for enterprise version
 - #6821 Blocker bugs found by sonar
 - #6826 SonarCloud Critical bugs
+- #6825 The system requires google test even when tests are disabled with BUILD_TESTS=OFF
 
 Enhancements:
 - #6750 Integrate SonarCloud for static analysis and test coverage
@@ -22,6 +23,7 @@ Enhancements:
 - #6803 Update Synergy icons
 - #6800 Update behaviour when unregistered
 - #6806 Move to Github Action for general PR builds and tests
+- #6816 Improve license validation
 
 v1.12.0-stable
 ===========
diff --git a/src/gui/src/LicenseManager.cpp b/src/gui/src/LicenseManager.cpp
index ee52f9a3a..3b7a3aef6 100644
--- a/src/gui/src/LicenseManager.cpp
+++ b/src/gui/src/LicenseManager.cpp
@@ -21,6 +21,7 @@
 #include <stdexcept>
 #include <utility>
 #include <QThread>
+#include <QTimer>
 
 LicenseManager::LicenseManager(AppConfig* appConfig) :
     m_AppConfig(appConfig),
@@ -44,12 +45,9 @@ LicenseManager::setSerialKey(SerialKey serialKey, bool acceptExpired)
         swap (serialKey, m_serialKey);
         m_AppConfig->setSerialKey(QString::fromStdString
                                   (m_serialKey.toString()));
-        emit serialKeyChanged(m_serialKey);
 
         emit showLicenseNotice(getLicenseNotice());
-        if (!m_serialKey.isValid()) {
-            emit InvalidLicense();
-        }
+        validateSerialKey();
 
         if (m_serialKey.edition() != serialKey.edition()) {
             m_AppConfig->setEdition(m_serialKey.edition());
@@ -228,3 +226,16 @@ LicenseManager::getTemporaryNotice() const
 
     return Notice;
 }
+
+void
+LicenseManager::validateSerialKey() const
+{
+    if (m_serialKey.isValid()) {
+        if (m_serialKey.isTemporary()){
+           QTimer::singleShot(m_serialKey.getSpanLeft(), this, SLOT(validateSerialKey()));
+        }
+    }
+    else{
+        emit InvalidLicense();
+    }
+}
diff --git a/src/gui/src/LicenseManager.h b/src/gui/src/LicenseManager.h
index d0401a5a3..9f8ec705e 100644
--- a/src/gui/src/LicenseManager.h
+++ b/src/gui/src/LicenseManager.h
@@ -47,8 +47,10 @@ private:
     AppConfig* m_AppConfig;
     SerialKey m_serialKey;
 
+public slots:
+    void validateSerialKey() const;
+
 signals:
-    void serialKeyChanged (SerialKey) const;
     void editionChanged (Edition) const;
     void InvalidLicense () const;
     void showLicenseNotice(const QString& notice) const;
diff --git a/src/lib/shared/SerialKey.cpp b/src/lib/shared/SerialKey.cpp
index 1db94308e..ed1854198 100644
--- a/src/lib/shared/SerialKey.cpp
+++ b/src/lib/shared/SerialKey.cpp
@@ -171,6 +171,20 @@ SerialKey::daysLeft(time_t currentTime) const
     return timeLeft / day + daysLeft;
 }
 
+std::chrono::milliseconds
+SerialKey::getSpanLeft(time_t time) const
+{
+    std::chrono::milliseconds timeLeft{-1};
+
+    if (isTemporary()){
+        auto expire{std::chrono::system_clock::from_time_t(m_expireTime)};
+        auto target{std::chrono::system_clock::from_time_t(time)};
+        timeLeft = std::chrono::duration_cast<std::chrono::milliseconds>(expire - target);
+    }
+
+    return timeLeft;
+}
+
 std::string
 SerialKey::email() const
 {
diff --git a/src/lib/shared/SerialKey.h b/src/lib/shared/SerialKey.h
index cfaf19da6..77f03ce01 100644
--- a/src/lib/shared/SerialKey.h
+++ b/src/lib/shared/SerialKey.h
@@ -19,6 +19,7 @@
 
 #include <string>
 #include <ctime>
+#include <chrono>
 #include "EditionType.h"
 #include "SerialKeyType.h"
 #include "SerialKeyEdition.h"
@@ -38,10 +39,11 @@ public:
     bool                isTrial() const;
     bool                isTemporary() const;
     bool                isValid() const;
-    time_t                daysLeft(time_t currentTime) const;
-    std::string            email() const;
-    Edition                edition() const;
-    std::string            toString() const;
+    time_t              daysLeft(time_t currentTime) const;
+    std::chrono::milliseconds getSpanLeft(time_t time = ::time(0)) const;
+    std::string         email() const;
+    Edition             edition() const;
+    std::string         toString() const;
 
     static std::string  decode(const std::string& serial);
 
diff --git a/src/test/unittests/shared/SerialKeyTests.cpp b/src/test/unittests/shared/SerialKeyTests.cpp
index 4c7b09f12..cd34bdd37 100644
--- a/src/test/unittests/shared/SerialKeyTests.cpp
+++ b/src/test/unittests/shared/SerialKeyTests.cpp
@@ -226,4 +226,19 @@ TEST(SerialKeyTests, IsValidExpiredKey_false)
     EXPECT_EQ(false, serial.isValid());
 }
 
+TEST(SerialKeyTests, test_getSpanLeft)
+{
+    SerialKey key;
+    std::chrono::milliseconds expected{-1};
+    EXPECT_EQ(expected, key.getSpanLeft());
+}
+
+TEST(SerialKeyTests, test_getSpanLeft_subscription)
+{
+    // {v2;subscription;basic;Bob;1;email;company name;0;86400}
+    SerialKey key("7B76323B737562736372697074696F6E3B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B303B38363430307D");
+    std::chrono::milliseconds expected{1000};
+    EXPECT_EQ(expected, key.getSpanLeft(86399));
+}
+