diff --git a/src/spider/runtime/Runtime.cpp b/src/spider/runtime/Runtime.cpp
index 7188517..b8a85ef 100644
--- a/src/spider/runtime/Runtime.cpp
+++ b/src/spider/runtime/Runtime.cpp
@@ -1,5 +1,7 @@
 #include "Runtime.hpp"
 
+#include <chrono>
+
 namespace spider {
 
     // Constructors & Destructors //
@@ -17,14 +19,17 @@ namespace spider {
     // Stepping/Running the Machine //
 
     void Runtime::step() {
-        // fetchInstr() decodes the opcode, addressing mode and type siz
+        // fetchInstr() decodes the opcode,
+        // addressing mode and type size
         cpu.fetchInstr();
-        // execute() completes the fetch-decode-execute cycle by calling the correct instruction method based on the opcode.
+        // execute() completes the fetch-decode-execute
+        // cycle by calling the correct instruction
+        // method based on the opcode.
         cpu.execute();
     }
 
     void Runtime::step(u64 n) {
-        while(n >= 4) {
+        while (n >= 4) {
             step();
             step();
             step();
@@ -34,9 +39,34 @@ namespace spider {
         while (n--) step();
     }
 
-    void Runtime::run() {}
+    u64 Runtime::run() {
+        // TODO: Must use the flag register
+        // for the enabled bit.
+        return 0;
+    }
 
-    //void Runtime::run(u64 n) {}
+    u64 Runtime::run(u64 n) {
+        using namespace std::chrono;
+        u64 total_steps = 0;
+        auto start_time = high_resolution_clock::now();
+        
+        // TODO: Must use the flag register
+        // for the enabled bit.
+        while (true) {
+            step();
+            step();
+            step();
+            step();
+            total_steps += 4;
+
+            // measure time!
+            auto current_time = high_resolution_clock::now();
+            auto elapsed = duration_cast<milliseconds>(current_time - start_time).count();
+            if (static_cast<u64>(elapsed) >= n) break;
+        }
+
+        return total_steps;
+    }
 
     // Misc //
 
@@ -50,7 +80,7 @@ namespace spider {
     void Runtime::hookReel(InstrReel* newReel, bool own) {
         delete this->reel;
         cpu.hookInstrReel(newReel);
-        if(own) this->reel = newReel;
+        if (own) this->reel = newReel;
     }
 
 }
diff --git a/src/spider/runtime/Runtime.hpp b/src/spider/runtime/Runtime.hpp
index 905041b..b91209a 100644
--- a/src/spider/runtime/Runtime.hpp
+++ b/src/spider/runtime/Runtime.hpp
@@ -55,14 +55,18 @@ namespace spider {
          * Sets the machine to run continously.
          * If interrupts occur, they will be handled
          * automatically.
+         * 
+         * Returns the amount of cycles ran.
          */
-        void run();
+        u64 run();
 
         /**
          * Runs this machine for a set amount of
          * milliseconds.
+         * 
+         * Returns the amount of cycles ran.
          */
-        void run(u64 ms);
+        u64 run(u64 ms);
 
     public: