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Pull your EX report directly from experian.com or annualcreditreport.com. It'll list a drop off date. To get an estimated DOFD, subtract 7 years from that drop off date. Since this is a CO, you can also look in the reported 7-yr history found within that report. When an account sours, it starts with a 30-day late, then a 60, 90, etc. DOFD begins at that 30-day late assuming it was never brought current again. You can also find DOFD within your own statements with the creditor.
SOL is the time frame a creditor has to sue you. It varies by state and can easily range anywhere from 3-15 years depending on the debt type and where you live. Check with your state's laws. Your attorney would know. In some states an acknowledgment of the debt, a payment, or a promise to pay can easily reset SOL. YMMV on where oyu live.
You've already hired an attorney. Good for you! Some people just ignore them and get a default judgement. Never do that, fight them!