diff --git a/docs/extending/plugins.md b/docs/extending/plugins.md
index 7e3e8810..2def2fd5 100644
--- a/docs/extending/plugins.md
+++ b/docs/extending/plugins.md
@@ -86,8 +86,11 @@ Built-in `project:*` commands always take precedence. A plugin whose `@command`
 
 Plugins run on the **host machine** via `PluginProxyCommand`. The plugin script is executed directly as a process with:
 
-- A 300-second timeout
-- TTY support when the terminal supports it (interactive commands work)
+- No timeout -- plugins may run arbitrarily long (deploys, imports, shells).
+  You watch the output and press Ctrl-C to abort if it looks stuck.
+- TTY support when the terminal supports it -- the plugin keeps the real
+  terminal, so colours and interactive prompts (`docker exec -it`, `read`, ...)
+  work as usual.
 - Arguments appended to the script invocation
 - Exit code forwarded to the caller
 
diff --git a/src/Plugin/PluginProxyCommand.php b/src/Plugin/PluginProxyCommand.php
index a780e415..28baa076 100644
--- a/src/Plugin/PluginProxyCommand.php
+++ b/src/Plugin/PluginProxyCommand.php
@@ -64,7 +64,9 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         /** @var list<string> $command */
         $command = array_merge([$this->plugin->scriptPath], is_array($args) ? array_values($args) : []);
 
-        $process = $this->processFactory->create($command, null, 300);
+        // No timeout: plugins may run arbitrarily long (deploys, imports,
+        // shells). The developer watches the output and aborts with Ctrl-C.
+        $process = $this->processFactory->create($command, null, null);
 
         if (Process::isTtySupported() && $output instanceof ConsoleOutputInterface) {
             $process->setTty(true);