I didn't mean it to be nosy, I seriously wondered why you'd be ready to spend 10+ hrs (as your schedule seems to suggest) in an airport lounge, when you could have a wonderful day in Stockholm.
On a different note - do SK offer standby for earlier flights for free? I mean it only makes sense if it's free - if you need to pay for changing the ticket, you could do it online, without having to physically STAND-BY.