Practical maximum max_locks_per_transaction?

[Ron <ronljohnsonjr@xxxxxxxxx>]

    v9.6.24 (being retired next year)
    
    https://www.postgresql.org/docs/9.6/runtime-config-locks.html
    
    "The default, 64, has historically proven
      sufficient, but you might need to raise this value if you have
      queries that touch many different tables in a single transaction,
      e.g., query of a parent table with many children."
    
    How "raised" is too raised?  I just had to increase
    max_locks_per_transaction from 640 to 1024 on an instance with many
    child tables and against which is run many large reports.  Another
    instance has zero children, but had to increase the value to 1280 to
    prevent reports from failing.

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