ISO 27002 log retention length requirements

Does anyone know what the ISO 27002 log retention length requirements are, if there are any?  Is there a reference that I can review?
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bbaoConnect With a Mentor IT ConsultantCommented:
the reference is just the standard itself.

as per section 10.10.1 Audit logging of ISO/IEC 27002,

"Audit logs should include, when relevant:

a) user IDs;
b) dates, times, and details of key events, e.g. log-on and log-off;
c) terminal identity or location if possible;
d) records of successful and rejected system access attempts;
e) records of successful and rejected data and other resource access attempts;
f) changes to system configuration;
g) use of privileges;
h) use of system utilities and applications;
i) files accessed and the kind of access;
j) network addresses and protocols;
k) alarms raised by the access control system;
l) activation and de-activation of protection systems, such as anti-virus systems and intrusion detection systems."

there is no particular *length* requirements in the standard, as a log should be the content of what actually happened, not the amount.

for more information, you may read section 10.10 Monitoring

hope it helps,
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