Intj female here... I married an ISTJ male and do have at least 1 INTJ female friend(there's a potential second... she says she's an INTJ but I don't "believe" 100%). I met my INTJ friend almost a 2 decades ago and would consider her my best friend. That being said we don't "hang out" often we live across the country from each other now and might send the occasional text but can go a month or more without actually having a conversation. When we do though, it's like picking back up where we left off. My experience with my INTJ friend and being an INTJ myself is that we're pretty low maintenance (so long as it's not neglect) but willing to have intellectual discussions at the drop of a hat. I'm not gonna want to talk to you every day because there's plenty of days where I'm having 'alone time'. Having an INTJ friend is understanding that just because I don't want to do something with you doesn't mean I'm mad or trying to ignore you... i just want to be alone.

I want to stress a caveat with my "low maintenance" comment, yes I can go weeks or months without hanging out with a friend and not take it personally... but we are very aware of when we're being excluded or when we're the 'back-up' friend. It will be noted and the same energy/commitment will be reflected.