This is the indivisible time interval after which your
data is regularly dumped to the disk. On the gui it is the
(correaltor dump time) * (number of cycles per integration)
The smaller you make this number (albeit you aren't allowed to go below 1ms)
the larger your data file will be. So, if you are in a RFI-free frequency range,
you may want to set your integration time to as much as 60s. However, if you are in
a zone often affected by RFI, you may want to set this to be a much smaller values, say, 1s.