So this can't be changed to become visible almost instantly?
Honestly, I don't know much about the back-end of SMF software but based on what "theymos" said (TryNinja's post) regarding its previous state (5 minute window) and how it is at the moment (10 minute window), then it can be altered.Maybe we should use TM or watermarks instead? 
Maybe (a transparent sign/letter might work as well)...You have made 3435 posts until now. If you would have added 38 seconds to each post, it would have consumed 36 hours extra. That's an aweful amount of time for something this unlikely.
You're right but since it's not a one time task, an extra step (after each post) shouldn't be that much of a problem.