Problem in Data Scheduling and loading time

Hi,

I am loading data from r3 to bw using process chain, all are delta loads and fico data.

process chain scheduled daily at 3.00 am.

Problem is that the data which is extracted into bw is up to 1.00 am only

1-2 and 2-3 (2) hours data is not extracted into bw side.

The client wants reduce the time gap and needs to load all data which acquired into r/3 before to schedule.

Any one can help me in investigation about this.

Thanks in advance.

br,

Narayana