diff --git a/tools/dev/bash_profile b/tools/dev/bash_profile
index a288765..1d987fd 100644
--- a/tools/dev/bash_profile
+++ b/tools/dev/bash_profile
@@ -107,7 +107,15 @@
 
 # Runs a sequence of STC scenarios until the first failure.
 function stcs {
-    for s in "$@"; do stc $s || return 1; done
+    for s in "$@"; do
+        if [[ $s =~ ^[0-9]*$ ]]; then
+            printf "Waiting %d seconds...\n" $s
+            sleep $s
+        else
+            printf "Running scenario %s...\n" $s
+            stc $s || return 1
+        fi
+    done
 }
 
 # Applies the settings in the specified topology recipe file or lists current
diff --git a/tools/test/bin/stw b/tools/test/bin/stw
index 8231ee7..677d29c 100755
--- a/tools/test/bin/stw
+++ b/tools/test/bin/stw
@@ -33,8 +33,13 @@
 
     # Iterate over all listed scenarios
     for scenario in "${@:-smoke}"; do
-        printf "Running scenario %s...\n" $scenario
-        stc $scenario
+        if [[ $scenario =~ ^[0-9]*$ ]]; then
+            printf "Waiting %d seconds...\n" $scenario
+            sleep $scenario
+        else
+            printf "Running scenario %s...\n" $scenario
+            stc $scenario
+        fi
     done
     status=$?