Is the process slow or some kind of another error?
Does your email look like that and mentions the "If your submission is accepted into Ingress[...]"? This is a new template that is sent out once your submission has passed Wayfarer, but sadly, it doesn't tell you outright anymore if the submission is too close, for example. My submission above passed Wayfarer, but upon checking again, it was 19m away from a portal, just barely enough that it's considered too close to the existing portal, so it didn't appear in Ingress.
Long story short, if you get the mail above, that isn't a guarantee that the portal will actually appear in Ingress.
Have the same with 3 approvals now. And they are far away from other portals. So "to close" cannot be the reason.
Sorry for the delay, @SirJurve! Upon reviewing your account, I could see that your submission 'Infotafel Innerartliche Planzenvielfalt' was rejected as there is a live Portal nearby. Thanks for understanding.