How is the the length of a marriage determined - by the date of separation, the date of the filing or the date of the divorce?

Question Details:

In DE alimony can be awarded for up to half the length of the marriage except in the case of long term marriages of more than 20 years when a lifetime of alimony can be awarded. I am a stay-at-home mom with little work experience. I have been married 19 years and 3 months, and my husband just moved out. Is it to my benefit to drag out the filing and date of divorce until after our 20th anniversary? Or will the alimony determination be made as of the day he moved out?

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