> When you have something you want to do and that you feel is in scope for your position, but you want a bit of reassurance or to let the boss know what you are up to, it’s common to reach out and ask them for permission. Don’t. Don’t ask for a yes. Instead, offer a chance to say no, but with a deadline.
If something is not in scope for your responsibility, obviously you must ask for permission.
If something is in scope for your responsibility, then just do the thing.
If it's in some weird edge case where you "feel" it is "in scope for your position" but you "want a bit of reassurance", then pick a lane. Either do the thing or ask for permission. Probably default to asking for permission unless a knowledgeable colleague tells you it's your call.
But setting some kind of deadline for your manager to opt-out is extremely disrespectful. If I ever had a report try to pull a stunt like that, it would be the first thing we'd talk about in our next 1-1.
Because if you have a manager who usually responds promptly, then you can ask for permission and get a quick reply. "Asking for no" is not making it more convenient for your manager, it comes across as trying to usurp their authority. "Hey, I'm going to tell HR you gave approval for a raise unless I hear from you by noon." That's... just not how anything works.
And if you have a manager who often misses e-mails or takes forever to respond, then it comes across as trying to take advantage of that to do stuff they wouldn't approve, in a sneaky way.
This is a bad look in every possible situation. Do not do this.
Like, if you're a journalist telling a source you'll print the story unless you get a correction by a deadline, OK fine. If you're looping in a peer as a courtesy (NOT a manager), then OK. But with your manager? That's crazy.