This is the length of time to spend accumulating dumps in the CDP as spectral data blocks. For this reason it must be a multiple of the dump duration.
Use shorter integrations if: source is strong enough to allow self-cal; phase is rapidly varying; observations require high time resolution; OTF mosaics.
The more channels you use, the longer the minimum integration must be, because the time required to read out the maximum number of channels (8192) is 512 ms. UV smearing effects need to be considered at longer baselines. See the Data Rate memo for more details.