Incorrect idp.pool.LDAP.validatePeriod property format

[Robo Burned]

Default configuration has the following in ldap.properties
idp.pool.LDAP.validatePeriod                   = 300
Connection Pool documentation says it must be Duration and  schema says it must be in ISO8601 format.
validateTimerPeriod    Duration    PT30M    Time between pool validation checks
When I use configuration of connection pool from  LDAP connector example  like this:
 validateTimerPeriod="%{idp.pool.LDAP.validatePeriod}"
I get an error (whole stacktrace attached) 
Failed to instantiate [long]: Factory method 'buildDuration' threw exception; nested exception is java.lang.IllegalArgumentException: 300
Best Regards,
Robo Burned
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