For reference, I started yo-yoing sometime during May during AP testing, which is like almost 8 months ago. I was breezing through tricks, until I hit boing-e-boing which is like late May. I started to get the hang of getting a few boings three weeks ago. Now, I can “do” the boing-e-boing.
So you can say that it took me around 7 months to get down the boing-e-boing.
So it’s okay; this trick takes a lot of practice. Even if you can’t do it fast after a month, keep on trying. Even after two months. Or three months. Or heck, even four, five, six, seven, eight months. Just keep on trying. Another option is to just move on to other tricks like me, and then occasionally try to attempt the boing-e-boing. Sooner or later, you can do it.