If you could do a search, you'd find a ton of great advice/info.
I wore figure-8 as tight as I could bear (raw scabs under the arms to prove it) for 6 weeks. Keeping it as stable as possible is the key. Being 38, the bones weren't healing as well as they should have, so at 8 weeks out doc prescribed a bone growth stimulator. Expensive ($4,000), but helped the bone heal faster. Wore the stimulator for 3 months. Overall a 5 month recovery time, but it was broken in 2 places, over a previous break 20 years ago.
If you are young you will heal faster. Don't push it! Once the bone glue sets in, the bones won't move/grind around as much, but it's very easy to re-break it. It will feel better, but it's only like rubber cement until the bone glue calcifies and turns to hard bone, which may take several months to a year.
I knew somebody who re-broke theirs at 3 months out by reaching quickly to swat a bee. Another guy with a broken CB was feeling great, so was shooting baskets. Reached up for a shot, and re-broke it.
Also, I feel that that the figure-8 helps to keep the bone aligned as much as possible. With just a sling your shoulder droops, and it will heal crooked like that.
Good luck!