diff --git a/README.md b/README.md
index fb02c0cc..87b764ee 100644
--- a/README.md
+++ b/README.md
@@ -235,9 +235,9 @@ If you need to view the unredacted value, see [`insecurely_log_authkey`](#insecu
 
 ### tailscale_up_timeout
 
-**Default**: `120s`
+**Default**: `120`
 
-Defines the timeout duration for the `tailscale up` command.
+Defines the timeout duration for the `tailscale up` command in seconds.
 
 >   --timeout duration
 >
diff --git a/defaults/main.yml b/defaults/main.yml
index 18d65869..7ef71b08 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -9,8 +9,8 @@ tailscale_authkey: ""
 tailscale_args: ""
 # Apply provided tags to node
 tailscale_tags: []
-# Set timeout for 'tailscale up' command
-tailscale_up_timeout: "120s"
+# Set timeout for 'tailscale up' command in seconds
+tailscale_up_timeout: "120"
 
 # Used for OAuth authentication
 # Register as an ephemeral node (recommended)
diff --git a/tasks/install.yml b/tasks/install.yml
index 033cadf5..de6635d2 100644
--- a/tasks/install.yml
+++ b/tasks/install.yml
@@ -113,7 +113,7 @@
 
 - name: Install | Build the final tailscale_args
   ansible.builtin.set_fact:
-    tailscale_args_string: "{{ tailscale_args }} {{ tailscale_tags_string | trim }} --timeout={{ tailscale_up_timeout | trim }}"
+    tailscale_args_string: "{{ tailscale_args }} {{ tailscale_tags_string | trim }} --timeout={{ tailscale_up_timeout | trim }}s"
 
 - name: Install | Final `tailscale up` arguments string
   ansible.builtin.debug:
@@ -142,7 +142,7 @@
     - not tailscale_up_skip
     - state_file is changed or not tailscale_is_online
   notify: Confirm Tailscale is Connected
-  async: 60
+  async: "{{ (tailscale_up_timeout | trim | int) + 10 }}"
   poll: 5
 
 - name: Install | Report non-sensitive stdout from "tailscale up"  # noqa: no-handler
diff --git a/tasks/main.yml b/tasks/main.yml
index 64b8f5ef..c58d487b 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -27,6 +27,15 @@
     - state != "absent"
     - not tailscale_up_skip
 
+- name: Tailscale timeout verification
+  ansible.builtin.fail:
+    msg: "`tailscale_up_timeout` variable should be parseable as an integer."
+  when:
+    - tailscale_up_timeout != 0
+    - (tailscale_up_timeout | type_debug == "bool") or not (tailscale_up_timeout | int)
+    - state != "absent"
+    - not tailscale_up_skip
+
 - name: Use tailscale_tags instead of tailscale_args for tags
   ansible.builtin.debug:
     msg: You must use `tailscale_tags` instead of `tailscale_args` to assign tags.