lynn P. is correct about the time limit for editing. The last time I checked, the window was 4 hours.
You'll often get faster results using the Report button (

at the left of the post). If you choose a specific moderator and PM them, it might be a while before they log in again and get your message. Everyone on the
Community Support Team sees reports so whoever is online next and can do the requested edit, will.
When you ask for an edit, it'll be fastest if you make it very clear which part of the post you want changed and what you want it to say. If we weren't sure exactly what you wanted, we might have to PM back and forth a few times to make sure we understood correctly.