Using the command line
You can issue the command provided here to set search limits of 4000 seconds and 2000 entries for user1 and user2 in cn=localhost location.
About this task
idsldapmodify -a -D <adminDN> -w <adminPW> -i <filename>where <filename>
contains: Dn: cn=Search1, cn=localhost
Cn: Search1
member: cn=user1,o=sample
member: cn=user2,o=sample
ibm-searchTimeLimit: 4000
ibm-searchSizeLimit: 2000
objectclass: top
objectclass: ibm-searchLimits
objectclass: groupofNames