Processing time for Family Based Green Card (Sibling) sponsored by US Citizen

Hi,

I have a doubt regarding the Green Cards issued under family category. Seems like there is lot of difference between a Sponsor being Citizen vs Green Card holder.

Question : If I’m a US citizen (hypothetical), and I want to sponsor my sister (sibling) for a Green Card, country of origin is India, how long will be the processing time be roughly ?

Tq,
Mahesh