FEAT/FAQ - FslWiki
There are many factors that affect how long FEAT takes to analyse a data-set. These include the speed of the machine, the amount of RAM and swap space available, the number of time points, the amount of activation present and the number of voxels in the data. In addition, higher level analyses take longer since first level analyses are carried out in native EPI space whilst higher level analyses are carried out in standard space and use FLAME - a sophisticated Bayesian mixed-effects estimation technique. Hence it is very difficult to give an accurate estimation for the length of time that FEAT should run. As a very rough guide, FEEDS includes (among other tests) a first level analysis with 180 time points and 64 x 64 x 21 voxels which takes less than 30 minutes on a modern PC (Athlon 2GHz) - for other machines see the FEEDS Timing Results. Higher level analyses is slower than this, and can often take 1-3 hours on a modern PC with a standard group size of 6-12 subjects.
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