6 weeks is a good time period, you are over the swelling and the piercing is well under way with the healing so placing the retainer in it won't irritate the piercing too badly.
There is no length requirement for getting your tongue pierced. Anyone can get their tongue pierced with the exception of people that have their own personal and/or medical reasons.
Typically you should wait at least 30 days before changing the tongue bar that you were pierced with. A shorter surgical steel tongue bar may be put in to replace the original tongue bar after swelling in the tongue goes down.
I got my tongue pierced over a week ago and my friend got her's a year before me. She drank on the third night after her piercing, and the swelling on her tongue went down. I also did the same, and swelling also went down. Just be careful, cause when you drink beer that early after piercing it, the tongue will tingle from the carbonation. My tongue ring is almost completely healed now.
Go watch a video of a tongue piercing on youtube. It takes like 2 seconds for the actual piercing but of course, the clamps go on before that which adds a little more time. So, not that long at all.
2 weeks (14 days)
Depends but usually no more than a week
I changed mine out in roughly 8-10 days. I'd suggest around 10 days though if you heal slow.
You need to wait 6 weeks so the piercing has time to stabilize. Changing jewelry too early can cause problems such as irritation, infection and/or scarring.
wait at least six weeks so as to give your tongue a chance to completely heal
Long-term effects of getting your tongue pierced can include gum recession, chipped teeth, nerve damage, and increased risk of infection. Additionally, the constant presence of jewelry in your mouth can lead to dental issues and interfere with speech and eating.
The barbell has to be longer to allow the tongue to swell, failure to allow for room can result in the barbell being pulled into the piercing and requiring surgical intervention to remove it from the tongue.
as long as you look after every individual piercing, of course it's safe