diff --git a/src/Makefile.am b/src/Makefile.am
index 5768a2c3..40db6522 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -94,6 +94,7 @@ libmodsecurity_la_SOURCES = \
 	rule.cc \
 	unique_id.cc \
 	variable.cc \
+	variable_duration.cc \
 	operators/operator.cc \
 	operators/detect_sqli.cc \
 	operators/detect_xss.cc \
diff --git a/src/assay.cc b/src/assay.cc
index 048239f9..22f8531d 100644
--- a/src/assay.cc
+++ b/src/assay.cc
@@ -95,6 +95,7 @@ Assay::Assay(ModSecurity *ms, Rules *rules)
     m_namesArgs(NULL),
     m_namesArgsPost(NULL),
     m_namesArgsGet(NULL),
+    start(std::chrono::system_clock::now()),
     m_ms(ms) {
     id = std::to_string(this->timeStamp) + \
         std::to_string(generate_assay_unique_id());
diff --git a/src/parser/seclang-parser.yy b/src/parser/seclang-parser.yy
index 28156d61..91f925ae 100644
--- a/src/parser/seclang-parser.yy
+++ b/src/parser/seclang-parser.yy
@@ -15,11 +15,13 @@ class Driver;
 #include "actions/transformations/transformation.h"
 #include "operators/operator.h"
 #include "rule.h"
+#include "variable_duration.h"
 
 using ModSecurity::actions::Action;
 using ModSecurity::actions::transformations::Transformation;
 using ModSecurity::operators::Operator;
 using ModSecurity::Variable;
+using ModSecurity::VariableDuration;
 using ModSecurity::Rule;
 
 }
@@ -246,13 +248,13 @@ variables:
     | variables PIPE RUN_TIME_VAR_DUR
       {
         std::vector<Variable *> *v = $1;
-        v->push_back(new Variable($3));
+        v->push_back(new VariableDuration($3));
         $$ = $1;
       }
     | RUN_TIME_VAR_DUR
       {
         std::vector<Variable *> *variables = new std::vector<Variable *>;
-        variables->push_back(new Variable($1));
+        variables->push_back(new VariableDuration($1));
         $$ = variables;
       }
 
diff --git a/src/variable_duration.cc b/src/variable_duration.cc
new file mode 100644
index 00000000..ba0ae224
--- /dev/null
+++ b/src/variable_duration.cc
@@ -0,0 +1,47 @@
+/**
+ * ModSecurity, http://www.modsecurity.org/
+ * Copyright (c) 2015 Trustwave Holdings, Inc. (http://www.trustwave.com/)
+ *
+ * You may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * If any of the files related to licensing are missing or if you have any
+ * other questions related to licensing please contact Trustwave Holdings, Inc.
+ * directly using the email address security@modsecurity.org.
+ *
+ */
+
+#include "src/variable_duration.h"
+
+#include <iostream>
+#include <string>
+#include <vector>
+#include <list>
+#include <chrono>
+#include <utility>
+
+#include "modsecurity/assay.h"
+
+namespace ModSecurity {
+
+std::list<std::pair<std::string, std::string>>
+    VariableDuration::evaluate(Assay *assay) {
+    std::list<std::pair<std::string, std::string>> resl;
+    std::string res;
+    std::pair<std::string, std::string> pair;
+
+    auto e = std::chrono::high_resolution_clock::now() - assay->start;
+
+    res = std::to_string(
+        std::chrono::duration_cast<std::chrono::microseconds>(e).count());
+
+    pair = std::make_pair(std::string("DURATION"), std::string(res));
+    resl.push_back(pair);
+
+    return resl;
+}
+
+
+}  // namespace ModSecurity
diff --git a/src/variable_duration.h b/src/variable_duration.h
new file mode 100644
index 00000000..1a793b4d
--- /dev/null
+++ b/src/variable_duration.h
@@ -0,0 +1,41 @@
+/**
+ * ModSecurity, http://www.modsecurity.org/
+ * Copyright (c) 2015 Trustwave Holdings, Inc. (http://www.trustwave.com/)
+ *
+ * You may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * If any of the files related to licensing are missing or if you have any
+ * other questions related to licensing please contact Trustwave Holdings, Inc.
+ * directly using the email address security@modsecurity.org.
+ *
+ */
+
+#include <vector>
+#include <string>
+#include <list>
+#include <utility>
+
+#ifndef SRC_VARIABLE_DURATION_H_
+#define SRC_VARIABLE_DURATION_H_
+
+#include "src/variable.h"
+
+namespace ModSecurity {
+
+class Assay;
+
+class VariableDuration : public Variable {
+ public:
+    explicit VariableDuration(std::string _name)
+        : Variable(_name) { }
+
+    std::list<std::pair<std::string, std::string>>
+        evaluate(Assay *assay) override;
+};
+
+}  // namespace ModSecurity
+
+#endif  // SRC_VARIABLE_DURATION_H_
diff --git a/test/test-cases/regression/variable-DURATION.json b/test/test-cases/regression/variable-DURATION.json
new file mode 100644
index 00000000..624840a5
--- /dev/null
+++ b/test/test-cases/regression/variable-DURATION.json
@@ -0,0 +1,52 @@
+[
+  {
+    "enabled":1,
+    "version_min":300000,
+    "title":"Testing Variables :: AUTH_TYPE",
+    "client":{
+      "ip":"200.249.12.31",
+      "port":123
+    },
+    "server":{
+      "ip":"200.249.12.31",
+      "port":80
+    },
+    "request":{
+      "headers":{
+        "Host":"localhost",
+        "User-Agent":"curl/7.38.0",
+        "Accept":"*/*",
+        "Content-Length": "27",
+        "Content-Type": "application/x-www-form-urlencoded",
+        "Authorization": "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ=="
+      },
+      "uri":"/",
+      "protocol":"POST",
+      "body": [
+        "param1=value1&param2=value2"
+      ]
+    },
+    "response":{
+      "headers":{
+        "Date":"Mon, 13 Jul 2015 20:02:41 GMT",
+        "Last-Modified":"Sun, 26 Oct 2014 22:33:37 GMT",
+        "Content-Type":"text/html"
+      },
+      "body":[
+        "no need."
+      ]
+    },
+    "expected":{
+      "debug_log":"Target value: \"[0-9]+\""
+    },
+    "rules":[
+      "SecRuleEngine On",
+      "SecDebugLog \/tmp\/modsec_debug.log",
+      "SecDebugLogLevel 9",
+      "SecRule DURATION \"@contains test \" \"phase:3,pass,t:trim\"",
+      "SecRule DURATION \"@contains test \" \"phase:3,pass,t:trim\"",
+      "SecRule DURATION \"@contains test \" \"phase:3,pass,t:trim\""
+    ]
+  }
+]
+