2 files changed, 4 insertions, 2 deletions
diff --git a/bin/dune b/bin/dune
index 73686e6..4874544 100644
--- a/bin/dune
+++ b/bin/dune
@@ -5,4 +5,4 @@
 (executable
  (public_name aoc2025)
  (name main)
- (libraries aoc2025))
+ (libraries aoc2025 unix))
diff --git a/bin/main.ml b/bin/main.ml
index 2cddf84..0ffbaac 100644
--- a/bin/main.ml
+++ b/bin/main.ml
@@ -37,7 +37,9 @@ let () =
     let fn = day_part_fn args.(2) args.(1) in
     let ic = open_in args.(0) in
     try
-      fn ic
+      let s = Unix.gettimeofday () in
+      fn ic;
+      Printf.printf "%.3f" ((Unix.gettimeofday ()) -. s)
     with e ->
       close_in_noerr ic;
       raise e