I'm Lucy, and I'd be happy to answer your questions today. I'm sorry to hear about your situation.
Roughly half the length of the marriage is a general rule of thumb, not a hard and fast rule. There are many scenarios where a person may wind up supporting a spouse for more than half the length of the marriage, such as if your wife is not legally permitted to work in the U.S.
If you signed documentation requesting that your wife be able to come to the U.S. on a visa, and that was granted, you may have also filed an affidavit of support. When you sign that, you're promising to make sure your wife has enough money to live in the U.S., and that's legally enforceable. Look to see what you signed - you may have agreed to support her until she has 10 years of work history in the U.S. (that's common). The judge has to enforce that promise, so your support could last much longer than half your marriage. Make sure to verify what you signed, and give your lawyer a copy.
The fastest way to get a divorce is if you and your wife can agree on all of the issues, including division of assets and spousal support. When you do that, it may be possible to skip a trial and get an order dissolving the marriage sooner. With that said, California has a mandatory 6 month waiting period before a divorce will be entered. It is unfortunately impossible to be divorced in less than six months, even if you've had a trial or a judge has approved your settlement. A judge can extend the six month waiting period, but cannot reduce or waive it.
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