I know a lot of high-level characters in-game and is always amazed to see them level up in a short amount of time, while I struggle to level at such a snail-ish pace. Their secret? Pilots. No, they're not the ones that fly a plane nor are they a pen brand. They're people employed (in some cases not even paid) by players to hand-level their characters while they deal with real life matters (work, studies, etc.).
