TimeLimit is part of the SearchRequest parameters sent from the DUA and typically is also an Administrative setting on the DSA.
Zero (0) implies there is TimeLimit for the SearchRequest.
If either the DSA or SearchRequest TimeLimit setting is exceeded then the LDAP_TIMELIMIT_EXCEEDED LDAP Result Code should be returned.
Typically this is a DSA setting vs a DIT setting and depending on the LDAP Server Implementation may be overridden by a per-user configuration. That is, some LDAP Server Implementations can be configured to not enforce DSA TimeLimit limits for Administrative users.