Mike,
What equipment are you using (camera? USB hub? what computer?)
To be honest I'm not exactly sure what "analyzing star data" actually means. It does seem like that's a long time to take flats, however it's not out of the question depending on your equipment. My camera takes 28 seconds to download a 1x1 bin flat image, so it would take me about 12min for 25 flats.
I don't think that "analyzing star data" is actually doing anything in this case, and even when it does (like calculating HFR for stars) it's nearly instantaneous on my computer.