Visa official Invite : Formalities and time taken to process


I am a Belgian who is officially already working for 6 months in Spain (with NIE, cerificado residencia) & who has a Ukrainian girlfriend.

Went already several times to her but also wanted to let her come over to the Schengen zone (before I went to Spain) but Europe is always delaying the visa-free traveling for Ukrainians. So will now try it with a visa.

My main question is about the official invite.
I need to go to the police to get an official invite.
Just need to go there & they will give it to me?
How long will this process take? (straightaway or will it take days/weeks/months?)

Thanks for reading :-)

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