I agree.....6 months to 12 months would be the average NRE length. Again, depending how much time you spend together. You didn't really give us very many details at all, so we don't have much to go on.
There are a lot of really awesome people here and you can get a lot of really good feedback. There is such a wide variety of people here that it's difficult to made assumtptions.
Some of the basic things that you might want to share are:
Your age and the ages of your partners.
Your gender and the genders of your partners.
You said. "I've been polyamorous for quite a while now".....What is "quite a while"? Is it 1 year, 10 years, 20 years??
You've been knowing this new person for "quite a while now"....how long is that? 2 months, 1 year, more???
This info might help people get a feel for who you are and be able to respond better !!!
The key to life is in being fully engaged and peacefully detached simultaneously and authentically in each moment.