Bought from the seller, he showed me a screenshot saying it will last until Oct 2017. Hopefully this is true. At the very least my account is premium (with Globe subscription) for now. It will change your spotify region to the Philippines so it might give you less choices for music, i don't know.
I am thus far pleased with the service and will update if theres any problem.
I have a question for the seller. I know that occasionally Spotify wants to verify that you are in the region that your account is based in. For example, I have a US account and if I let my friend in Taiwan use it for about 2 weeks without me logging it, Spotify will request that you log in from the US. Will this happen to these accounts and if so what solution do you have for us to get around this? Proxy? VPN?