>>268870498
You heard a few random people speculating. They could probably compress further, but the game is legitimately large enough with high enough resolution textures that it's not that unreasonable that it takes up 130 GB. It's not just how long the game is, but how many unique things are present that have textures. But the game itself is actually not very short. On the lowest difficulty and only doing the main quest, it takes around 16-20 hours to complete. On medium difficulty and completing a decent amount of the side content, it takes more often 30-40 hours.