Tired of regularly logging in and clicking the “Remember me” checkbox? No more. With this plugin, once 
you have logged in and until you voluntarily log out, your blog will remember you.
The ‘Remember Me’ checkbox on the login form will be always checked, and instead of logging you in for 14 days, the expiration is set to one year.
Related: for your localhost hacking, see plugin <a href="https://wordpress.org/extend/plugins/no-login/" rel="ugc">No Login</a>
<h3>Support</h3>
On <a href="https://github.com/ozh/always-remember-me" rel="nofollow ugc">Github</a>. I don’t read WordPress support forums.

Always Remember Me

Always checked 'Remember Me' checkbox and longer auth cookie expiration. Your blog will remember you.

John Morris

Do you use the “Remember Me” feature when logging in to your WordPress site? I know I do.
Do you find it annoying when WordPress stops remembering you after a few days? I know I do.
Longer Login is a simple WordPress plugin that remedies this. By default, WordPress automatically 
forgets users after 14 days. This plugin adds an option in your website’s General Settings that 
can change this expiration date. There are numerous options ranging from 1 day to 1 year.
Change the setting, and the next time you, or any user on your site logs in with “Remember Me” checked, 
WordPress will keep them logged in for that specified time.
<h4>How Does It Work?</h4>
To remember users, websites store a small piece of information in your web browser’s memory. 
This token of information is called an <a href="wikipedia.org/wiki/HTTP_cookie" rel="nofollow ugc">HTTP cookie</a>. These 
cookies have an expiration date specified by the website.
By default, WordPress websites have their persistent login cookies expire after 14 days. This plugin 
changes the length of time the cookie will survive. Instead of 14 days after login, you can make the 
cookie live for as long as 1 year after login.

Longer Login ("Remember Me" Extension)

Longer Login allows customizing the length of WordPress' "Remember Me" length. No more automatic logouts every few days!

Always Remember Me vs Longer Login ("Remember Me" Extension)