I've had my nose pierced recently 6 months ago and it is still not healed so it does vary. It's almost there and I think it will take another month to fully heal up. I did my own with a gun and husband waited and got his done by a professional piercer.
Don't go to Claire's or a beauty salon that pierces with a gun. Why?
Hygiene of the piercing tool. Even though they change cartridge holding jewellery, you can still get traces of others pathogens and I wouldn't risk it. The people at Claire's are handling money and everything else shove on gloves with unclean hands and then start going at your nose. No thanks
Going to a professional piercer with proper equipment and sterilised environment means autoclave is use, they wash hands/alcohol geland then use gloves etc
The jewellery they use in guns does not pierce as well as needles that piercers use. guns don't give a clean pierce as the arrow point end of the jewellery is not as sharp as needle. Taking longer to heal and a rougher pierce site.
Guns use sharp ended jewellery to pierce and stay in the nose and this can be uncomfortable and the post that goes through nose can end up too long after initial swelling. This can rub and irritate while healing prolonging healing things!
Husband's is healing extremely well after 8 weeks and 6 months later I'm still here getting little mini lumps around my nose jewellery.
I'm in my 40s and a few friends and work colleagues have got in done recently. Everyone's has healed well who got it done with needle.