Go to Settings->Passster->Options.
Here you can activate / deactivate cookies and add an expiration time.
Cookies are saved on the computer from your users. With that they could immediatly access all content with the same password.
You could also use this if you like to protect multiple areas in your content (or on the whole page).
Your imagination is the limit! Protect, share authorization and other awesome stuff with cookies!
The cookie solution ist cache-compatible and works with several caching plugins like W3TC, WPSuperCache or WPRocket.
You can cache your whole side and protect it with passster.