Don't get me wrong. moving in together is a big step no matter whose apartment you're moving into. There's a big difference between hanging out often and actually being around each other constantly because you share the same space.
It doesn't matter how long you've been together before you make this decision, though.
A lot of people will disagree with me, and that's fine. Maybe they've experienced a situation where they felt robbed of personal space and time. Maybe they fought more frequently with their S.O. when they were constantly together. It's unfortunate, but it happens.
You both only really need one prerequisite of sorts before coming to a conclusion if moving in together is the best decision for you...
You love each other.
If you both love each other, you can sit down and discuss this important next step. It's important to acknowledge each other's boundaries, love languages, and need for space.
It's not a "test" to see if your relationship is the "real deal" or if it's going to last. You shouldn't be wagering your living and romantic situations on a gamble just to see what happens. It's a commitment, in more ways than one.
Don't worry about time. It doesn't really matter how long the two of you have been together if the feelings are there and they're real. Your two opinions on if it's "too soon" are the only ones that matter. No one else knows what your relationship is really like, no one else knows the love that's in your heart.
At the end of the day, it's up to both of you to decide if waking up next to each other every day is what's best. Sharing space can be tricky, but if you communicate effectively, it won't be an obstacle.
Don't even worry about measuring your relationship in time. Instead, measure it in love.