If you choose a weak starting position, it's not going to take 2.5 hours for your opponents to win in Settlers of Catan. But if you do have an obviously weaker board position, no one will put the robber on your 2, 3s, 11s, or 12, except in rare situations. That's part of the built-in handicapping for those with obviously stronger board positions. Those 5/36 rolls don't actually produce 5/36 of the time, because most of the time the robber is blocking one of them.
If you choose a weak initial position, the expansion-first player gains an advantage over the city-first player, especially in a 3-player game. And they will both know that your only option is a card-first stealth victory. The latter is usually only viable in a very balanced 4-player game.
If you don't understand probability for 2d6 dice rolls, yeah, you're going to have a bad time in a lot of games, some of them lasting 2.5 hours or more. And if you haven't bothered learning that, why would you learn from the stronger opponents that you play?
If you choose a weak initial position, the expansion-first player gains an advantage over the city-first player, especially in a 3-player game. And they will both know that your only option is a card-first stealth victory. The latter is usually only viable in a very balanced 4-player game.
If you don't understand probability for 2d6 dice rolls, yeah, you're going to have a bad time in a lot of games, some of them lasting 2.5 hours or more. And if you haven't bothered learning that, why would you learn from the stronger opponents that you play?