You should see your changes reflected on the site right away. Some admin changes like translations are cached on the server so Print Stores stay optimized and fast to load.
It can take up to 15 minutes for these isolated changes to take effect. Other CSS related changes may require you to clear your browser cache to preview correctly.
You can use Query Strings for the browser to download a fresh copy. Change your style sheets like this <link rel=”stylesheet” href=”style.css?v=3.4.1″ > to something like this: <link rel=”stylesheet” href=”style.css?v=3.4.2″ >