Length of time doesn't matter. The parties must do 3 things simultaneously. 1) Live together in Texas, 2) have an agreement to be married, and 3) hold themselves out to the public as married. Item 1 is simple. But, that "agreement" in #2 can be written or ORAL-leaving open a "He said/She said" scenario. Same applies to #3. In my experience, he & his previous girlfriend did live together in TX. They had no children together, no joint checking acct & filed tax returns as single. But, she referred to herself as his wife & to him as her husband. He didn?t do the same but let her comments slide to avoid grief. 3 YEARS AFTER SHE MOVED OUT, she sued for divorce claiming common-law marriage, wanted a divorce & 1/2 of everything he had. 1st judge ruled they were married THE DAY THEY MOVED IN TOGETHER. That ruling was appealed. It took another yr & 3 months of depositions, turning over of personal records, and tons of money both to his lawyer & to her via settlement saying that they were NEVER married to finally end it. He even had an application she filled out 6 months prior to her filing for divorce where she claimed to be married TO SOMEONE ELSE. But, that still didn't stop the nonsense.