I don’t spend my own money on gambling. I only spend what I win at poker or play when there’s an opportunity to get a free bonus, such as casino bonus funds or free spins. So, in fact, I’ve never played for more than 1–2 hours 🙂
I’ve never gone anywhere near 12 hours in one session. A few hours is already enough for me, especially when you start getting tired and your decisions aren’t as sharp.