diff --git a/d1/main.cxx b/d1/main.cxx
index 6ba8ee0..1a267e9 100644
--- a/d1/main.cxx
+++ b/d1/main.cxx
@@ -10,7 +10,7 @@ constexpr const char content[] = {
     #embed "input.txt"
 };
 
-void part_1() {
+int part_1() {
     std::vector<int> left_vec, right_vec;
     std::istringstream iss{content}; 
 
@@ -27,10 +27,10 @@ void part_1() {
         diff_acc += std::abs(left_vec[i] - right_vec[i]);
     }
 
-    cout << diff_acc << endl;
+    return diff_acc;
 }
 
-void part_2() {
+int part_2() {
     std::vector<int> left_vec;
     std::unordered_map<int, int> right_map;
     std::istringstream iss{content}; 
@@ -45,12 +45,17 @@ void part_2() {
     for (auto left_num : left_vec) {
         sim_acc += right_map[left_num] * left_num;
     }
-
-    cout << sim_acc << endl;
+    
+    return sim_acc;
 } 
 
 int main() {
-    part_1();
-    part_2();
+    std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
+    auto p1_val = part_1();
+    std::chrono::steady_clock::time_point middle = std::chrono::steady_clock::now();
+    auto p2_val = part_2();
+    std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
+    cout << "Part 1: " << p1_val << " (" << std::chrono::duration_cast<std::chrono::microseconds>(middle - begin).count() << "µs)" << endl;  
+    cout << "Part 2: " << p2_val << " (" << std::chrono::duration_cast<std::chrono::microseconds>(end - middle).count() << "µs)" << endl;
     return 0;
 }
diff --git a/d2/main.cxx b/d2/main.cxx
index bc01286..5a828ec 100644
--- a/d2/main.cxx
+++ b/d2/main.cxx
@@ -40,7 +40,7 @@ bool safe(const std::vector<int>& level) {
   return true;
 }
 
-void part_1() {
+int part_1() {
     std::istringstream iss{content}; 
     std::string line;
     int correct_acc{0};
@@ -62,7 +62,7 @@ void part_1() {
             correct_acc++;
         }
     }
-    cout << correct_acc << endl;
+    return correct_acc;
 }
 
 bool safe_dampener(const std::vector<int>& level) {
@@ -80,7 +80,7 @@ bool safe_dampener(const std::vector<int>& level) {
     return false;
 }
 
-void part_2() {
+int part_2() {
     std::istringstream iss{content}; 
     std::string line;
     int correct_acc{0};
@@ -102,11 +102,16 @@ void part_2() {
             correct_acc++;
         }
     }
-    cout << correct_acc << endl;
+    return correct_acc;
 } 
 
 int main() {
-    part_1();
-    part_2();
+    std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
+    auto p1_val = part_1();
+    std::chrono::steady_clock::time_point middle = std::chrono::steady_clock::now();
+    auto p2_val = part_2();
+    std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
+    cout << "Part 1: " << p1_val << " (" << std::chrono::duration_cast<std::chrono::microseconds>(middle - begin).count() << "µs)" << endl;  
+    cout << "Part 2: " << p2_val << " (" << std::chrono::duration_cast<std::chrono::microseconds>(end - middle).count() << "µs)" << endl;
     return 0;
 }
diff --git a/d3/main.cxx b/d3/main.cxx
index aeb7a47..85865e1 100644
--- a/d3/main.cxx
+++ b/d3/main.cxx
@@ -7,7 +7,7 @@ constexpr const char content[] = {
     #embed "input.txt"
 };
 
-void part_1() {
+int part_1() {
     std::string input = std::string(content);
 
     auto acc{0};
@@ -22,10 +22,10 @@ void part_1() {
         input = match.suffix().str(); 
     } 
 
-    cout << acc << endl;
+    return acc;
 }
 
-void part_2() {
+int part_2() {
     std::string input = std::string(content);
 
     auto acc{0};
@@ -46,11 +46,16 @@ void part_2() {
         input = match.suffix().str();
     }
     
-    cout << acc << endl;
+    return acc;
 } 
 
 int main() {
-    part_1();
-    part_2();
+    std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
+    auto p1_val = part_1();
+    std::chrono::steady_clock::time_point middle = std::chrono::steady_clock::now();
+    auto p2_val = part_2();
+    std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
+    cout << "Part 1: " << p1_val << " (" << std::chrono::duration_cast<std::chrono::microseconds>(middle - begin).count() << "µs)" << endl;  
+    cout << "Part 2: " << p2_val << " (" << std::chrono::duration_cast<std::chrono::microseconds>(end - middle).count() << "µs)" << endl;
     return 0;
 }
diff --git a/d4/main.cxx b/d4/main.cxx
index 65114e8..88da3af 100644
--- a/d4/main.cxx
+++ b/d4/main.cxx
@@ -48,7 +48,7 @@ int count_xmas(const std::vector<std::string> &grid, int i, int j) {
     return up + down + left + right + up_left + up_right + down_left + down_right;    
 }
 
-void part_1() {
+int part_1() {
     std::istringstream input_stream(content);
     std::string line;
     std::vector<std::string> grid;
@@ -66,7 +66,7 @@ void part_1() {
         }
     }
 
-    cout << count_acc << endl;
+    return count_acc;
 }
 
 
@@ -94,7 +94,7 @@ bool is_mas_cross(const std::vector<std::string>& grid, int i, int j) {
     return true;
 }
 
-void part_2() {
+int part_2() {
     std::istringstream input_stream(content);
     std::string line;
     std::vector<std::string> grid;
@@ -112,11 +112,16 @@ void part_2() {
         }
     }
 
-    cout << count_acc << endl;
+    return count_acc;
 } 
 
 int main() {
-    part_1();
-    part_2();
+    std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
+    auto p1_val = part_1();
+    std::chrono::steady_clock::time_point middle = std::chrono::steady_clock::now();
+    auto p2_val = part_2();
+    std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
+    cout << "Part 1: " << p1_val << " (" << std::chrono::duration_cast<std::chrono::microseconds>(middle - begin).count() << "µs)" << endl;  
+    cout << "Part 2: " << p2_val << " (" << std::chrono::duration_cast<std::chrono::microseconds>(end - middle).count() << "µs)" << endl;
     return 0;
 }