I tried a trial with local dummy db of size just 1.5GB in which i tried inserting 10Cr records to one table with only 1 field currenttimestamp and executed. At this same time i started nbackup for this db it also take approximately 20-30 minutes in the mean while the delta file was increasing, I had also incuded -d ON switch.

So do we have to understand that time for nbackup(0/1/2) for an active DB is approximately 30 minutes or is there anything else that has to be taken care.