diff --git a/viper.example.yaml b/viper.example.yaml
index 095bbdd..deef611 100644
--- a/viper.example.yaml
+++ b/viper.example.yaml
@@ -8,7 +8,7 @@ ca:
     ext_key_usage: 
         - 1
         - 2
-        duration: 518400 #1 year
+        duration: "8760h0m0s" #1 year
 client:
     serial_number: 12151232 # serial number
     subject:
@@ -28,4 +28,4 @@ client:
     ext_key_usage: 
         - 1
         - 2
-    duration: 518400
\ No newline at end of file
+    duration: "8760h0m0s"
\ No newline at end of file