diff --git a/2019/src/runner.cpp b/2019/src/runner.cpp
index e07fb05..7cf8004 100644
--- a/2019/src/runner.cpp
+++ b/2019/src/runner.cpp
@@ -1,4 +1,5 @@
 #include "solutions.hpp"
+#include <chrono>
 #include <iostream>
 #include <boost/program_options.hpp>
 
@@ -7,14 +8,16 @@ namespace po = boost::program_options;
 struct AoCOptions {
     int day;
     bool part2;
+    bool run_timer;
 };
 
-AoCOptions parse_options(const int argc, const char* argv[]) {
+static AoCOptions parse_options(const int argc, const char *argv[]) {
     AoCOptions options{};
     po::options_description desc("Allowed options");
     desc.add_options()
             ("day", po::value<int>(&options.day)->required(), "The day to run.")
-            ("part2,2", po::bool_switch(&options.part2), "Whether to run part 2.");
+            ("part2,2", po::bool_switch(&options.part2), "Whether to run part 2.")
+            ("timer,t", po::bool_switch(&options.run_timer), "Show the execution time.");
 
     po::positional_options_description positionals;
     positionals.add("day", 1);
@@ -33,7 +36,12 @@ int main(int argc, const char *argv[]) {
 
         const aoc2019::solution_t solution = aoc2019::get_implementation(options.day, options.part2);
         if (solution != nullptr) {
+            const auto start = std::chrono::high_resolution_clock::now();
             solution(std::cin, std::cout);
+            if (options.run_timer) {
+                const std::chrono::duration<double> duration = std::chrono::high_resolution_clock::now() - start;
+                std::cerr << "Time taken: " << duration.count() << "s\n";
+            }
             return 0;
         } else {
             std::cerr << "Unimplemented.\n";