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Field length
The maximum number of characters a column allows, given in each record layout.
Every record layout lists a Field Length for each column, for example 50 for enrollee names, 11 for Enrollee ID, 10 for dates, 8 for times and up to 2,000 for issue descriptions.
Sources: ODAG protocol, Universe Table 1 record layout, PDF pp. 17-21; FA protocol, record layouts Field Length column, PDF pp. 10-27.