[Eeglablist] ICA on a large number of data

[Mauro Gianni Perrucci]

I would like to analyze a data set of eeg data using ICA,
but the data sets is very large, about 2 hours of acquisition.
Can be applied ICA on a portion of the data (i.e. 20min with
Fc=512Hz), calculate the mixing matrix and then use that on the full
data set?
How can I do with eeglab ?
Greetings

Gianni Perrucci