Depends on so many things
- the format (some hypers are faster than others)
- your edge in the game (if any — depends on the format, other regs, game selection)
- buyin (higher buyin games are harder, ldo)
- your rakeback/VIP status (this can be counted as part of your earnings from each game you play)
- your personal attitude to risk
- your ability to reload from offline funds/earnings if your online account goes busto
How much other people have in their bankroll isn't really that important imo. As you're a beginner, I'd advise you just start off in games where you are comfortable with the amount of money you are risking, and see how you get on. But once you get going you'll see how big the swings are, and if you want to turn it into an income then you will probably need a bankroll of several hundred buyins, and perhaps as many as a thousand.
If you want to see how some of the best players in your game are doing then try and look them up on a results tracking service such as sharkscope. In a game like hyper STTs, where edges are usually minuscule, you won't really get much of an idea of your expectation in the game until you have played several thousand games.
GL