Hi Mahesh,
LO extractors do not support real time functionality as of now.
The reason is because they work based on setup tables and extraction queues. You can only do near real time but in this case you will have to schedule your infopack frequently and (delta queue fill up)jobs in ECC at shorter intervals.
For example, in one of my project we were extracting data every 1 hour by managing scheduling of jobs in SAP ECC and infopackages in SAP BW.
Thanks
Amit