I'm currently reading the Game of Thrones How long will it take for me to reAd it It's summer vacation so I try to read for at least 20 min everyday Btw I'm 12 years old?

12 Years-old is actually way to young to be reading Game of Thrones. If you're reading it for only 20 minutes a day, it could take you a month or 2 to finish reading it depending on your reading speed.