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Length of marriage is not the only factor considered in the court determining spousal support. There is living standard, employment opportunities, to name a few. I strongly recommend contacting a family law attorney in your area. Good luck.
Generally, (and I do mean generally), the longer you are married the longer you can expect to receive spousal support. The concept of "lifetime support" is pretty much gone these days, but you can expect that the ten year mark is a milestone on this context. Spousal support is indeed a function of many factors, only one of which is length of marriage, so you really should consult with an experienced family law attorney for more details on this issue. Good luck.