How long do you think it will take for a 1st degree burn like this to heal? 2 weeks?

If it's really bad you should see a doctor and they might give you a medicated cream or you could go straight to the pharmacy and see what they recommend but I'm not sure you should be taking antibiotics unless a doctor or someone told you to. Also cocoa butter isn't going to do anything. A medicated cream will make it heal a bit faster so maybe a week or so. However I wouldn't plan on it everyone heals differently and we can't see how bad it is. I also wouldn't be suprised if it scars because they usually do. :)