how long do i need to support my bi-polar spouse?

I am thinking about divorcing my bipolar wife. we are married for 8 years and she never worked outside home. I cannot take it any more of her abusive behavior . In CA, if I divorce her , how long do i need to support her and how much (percentage of my income) per month i need to give her any primary estimate ?
she never worked to earn money and I did not know about her disease until our marriage was 3 year old


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