Is the site keep asking you to relogin every single time?
It's due to your browser settings. For chrome, you need to click here chrome://settings/content/cookies?search=cookies to change a setting. The reason why its not working is because you have "block third party cookies activated". To fix this, just add us to your whitelist: [*.]sharing.wtf.
How long does it take for my premium to be activated after purchasing? Your premium activation will be instant. But you need to relogin for it to be reflected on your end. If your premium is not activated, send us a message through the contact page.