What’s your ideal run length for a small RL?

Hey Hi! I was wondering what per-run length keeps you in flow without dragging? If you have to choose one it’ll be : 5–8 min / 10–15 / 20–30 / 45–60 / more 😱. And what I want to know is why with an example?

For me it's 20-30 minutes with Balatro, I try to lose quickly by taking risks, but if it works... 😎. My satisfaction comes from that. If the run is too long (over 30 minutes), i get bored. Succeeding in under 30 minutes is a sweet melody.
Am I alone in this?