diff --git a/01_phase_rust_src/sv/src/main.rs b/01_phase_rust_src/sv/src/main.rs
index 944a2f1..fad9b6e 100644
--- a/01_phase_rust_src/sv/src/main.rs
+++ b/01_phase_rust_src/sv/src/main.rs
@@ -9,14 +9,25 @@ fn main() {
 
     // def env variables.
     let svdir_env = env::var("SVDIR");
-    //let svwait_env = env::var("SVWAIT");
+    let svwait_env = env::var("SVWAIT");
 
     let svdir_var = match svdir_env {
         Ok(var) => var,
         Err(..) => "/run/runit/service".to_string(),
     };
 
+    // TODO: check if directory exists
+
+    let svwait_var = match svwait_env {
+        Ok(env) => match env.parse::<i32>() {
+            Ok(var) => var,
+            Err(..) => 7,
+        },
+        Err(..) => 7,
+    };
+
     dbg!(svdir_var);
+    dbg!(svwait_var);
 
 
     // args