I want to know how long shoulder fillers usually last.

I am considering trapezius Botox and fillers together to achieve square shoulders, but I feel it would be a waste if the shoulder fillers don't last long. I did some research before my consultation and found that the duration of the fillers varies quite significantly depending on individual body type. Are there any people who have had this done and found that the effects last for more than six months? If the fillers last about a year, I would like to book an appointment right away. I would appreciate advice from those who are knowledgeable about touch-up cycles and longevity!