Been running notebooks on serverless compute and watching the indicator in the UI. After my last cell finishes, it goes from dark green to this fading green, sits there for maybe 5-10 minutes, then finally goes grey. Pretty sure I'm paying for that entire fade window.

SQL warehouses let you set auto-stop. All-purpose clusters have auto-termination. I can't find anything like that for serverless notebooks. Does it exist and I'm missing it, or is there genuinely no knob for this?

Other thing — when I manually detach, the indicator still fades green for a bit before going grey. Is billing actually stopping when I detach, or am I paying through the teardown too?

Can't find clear docs on either point. If anyone's compared system.billing.usage billed seconds against actual cell execution time, curious what that gap looks like.

I am really expecting some expert and first-hand experience answers rather than sharing some documentation or LLM Answers(because I asked LLMS)