diff --git a/bash/script_runtime.bash b/bash/script_runtime.bash
new file mode 100644
index 0000000..b05f74c
--- /dev/null
+++ b/bash/script_runtime.bash
@@ -0,0 +1,11 @@
+#!/bin/bash
+
+sleep 5000
+
+secs=$SECONDS  # utilise bash builtin SECONDS
+hrs=$(( secs/3600 )); mins=$(( (secs-hrs*3600)/60 )); secs=$(( secs-hrs*3600-mins*60 ))  # integer maths gives whole numbers
+
+printf 'Time spent: %02d:%02d:%02d\n' $hrs $mins $secs
+
+# output would be
+# Time spent: 01:23:20