How long does the VPN trial period last & When it ends how much will it cost?

Which VPN are you referring to? The built-in VPN in desktop Firefox and more recently in Firefox for Android is free with a monthly 50GB data usage limit that resets on 1st of new month. https://support.mozilla.org/en-US/kb/mobile-android-vpn https://support.mozilla.org/en-US/kb/built-in-vpn It is the standalone Mozilla VPN app http://vpn.mozilla.org that has a monthly and annual subscriptions. If you are referring to subscription trials then see https://support.mozilla.org/en-US/kb/subscription-free-trials