In the case of the Caucasian Albanian written language, the span of time between when the script was first seen (though not yet identified) until the first word was deciphered took 11 years. Of course, not all that time was spent trying to crack the code.
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EOAI - Effective Orifice Area Index [Internet]; Apr 14, 2017 [cited 2017 Apr 14]. Available from: https://www.allacronyms.com/EOAI/Effective_Orifice_Area_Index. MHRA. 'EOAI - Effective Orifice Area Index', All Acronyms, 14 April 2017, <https://www.allacronyms.com/EOAI/Effective_Orifice_Area_Index> [accessed 14 April 2017] Bluebook. All Acronyms, EOAI - Effective Orifice Area Index (Apr. 14, 2017, 6:04 PM), available at https://www.allacronyms.com/EOAI/Effective_Orifice_Area_Index.