Greetings @Lu Kor and welcome to the expat.com forum. And good luck importing your fiancee! :-)
Firstly, to clarify the steps: (1) get your partner a visa to enter Spain with you, (2) go register your relationship, and (3) apply for family reunification for the wife/partner of a Spanish/EU citizen.
I'm not an expert on "pareja de hecho", but I'd be surprised if there were a 6 months wait. I think it can be done at the notary, which should be pretty quick. Plus you can probably pay an attorney or gestor to help you speed things along. You should check the exact requirements, as some will want your padron certificate, and you might need some proof that your relationship has existed for some specified period of time (not necessarily inside Spain).
I think the time requirement varies, so there are regions which don't need it. I think Valencia is one. Personally, I'd go where there was one less thing needed. :-)
I'm not sure, but probably the notary might want to see some proof that neither of you is already married. So you should check this issue, and make sure you both have such documents.
And even if there is a long wait, you could wait until nearer the appointment before entering Spain... or leave for a while... in order to avoid overstaying her visa allowance. Generally, overstaying is a bad idea, and you should avoid it. However, overstaying to get the pareja de hecho would be much worse than overstaying after you've submitted the family reunification application (as it should be granted).
Separately, parejo de hecho is a civil union, whereas you said she was your fiancee, which usually implies that a wedding coming up. And I doubt there's a long wait if you wanted to get married.
I believe that Spain will recognize marriages and civil unions from many other countries (but check which ones before you pick one!), so you don't have do this inside Spain and coordinate with your residence application. You can do it outside Spain, then do your residence application as soon as you arrive.
Here's a useful link about pareja de hecho:
And the specific instructions for doing it:
"What are the main requirements to register a civil partnership?
The requirements will vary depending on the autonomous community or region in which you are located. However, some of them are generally applicable throughout Spain. Those are:
- The European Union citizen member of the couple must be a resident in the Spanish territory
- Both partners are required to be registered at the same address
- Depending on the region in which you are based, a minimum period of living together may be required
- The civil union must be registered, by public deed, before a notary
- Both members must be of legal age or emancipated
- Neither of them can be married"
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