3 minutes, 30 minutes, sure, I've discovered a lot of junior folks would figure things out on their own when I couldn't get back to them immediately, and tended to add some delay just to encourage trying a little harder before contacting me. I would say even 3 hours has value. Buy yourself a rubber duck and have a heart-to-heart about your problem.
3 days is going to result in lots of folks getting stuck in local minima, likely confusing themselves in the process. To be clear, sometimes a problem requires a deep dive, or there is no one who can provide useful help. Even then, some guidance just to get outside perspective is helpful.