I've requested access to "Black People under the Black Flag - Arne Bialuschewski" and since this is my first time using this program i wanted to ask, how long it normally takes to get access to a writing like that.
As the author of this paper (https://www.researchgate.net/publication/249044801) is not a member of ResearchGate, you will not get access. Note that your request means nothing more than a message sent to the authors. The authors may send you the file, or may not. Often they do not have a file. See also the help page https://help.researchgate.net/hc/en-us/articles/14292986311825-Discovering-and-requesting-research: "If the authors are on ResearchGate and have added the publication to their profiles, the request is sent straight to them. If the authors choose to make the full-text available either publicly or by privately sharing it with you, you’ll receive a notification. If none of the authors are on ResearchGate, your request will be saved and passed to them should they join ResearchGate in the future."