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From the document I saw that

# Max number of entries to append to a ledger before triggering a rollover
# A ledger rollover is triggered after the min rollover time has passed
# and one of the following conditions is true:
#  * The max rollover time has been reached
#  * The max entries have been written to the ledger
#  * The max ledger size has been written to the ledger

We also need to set managedLedgerMinLedgerRolloverTimeMinutes=0