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OK, then you need plenty of darks to handle the dark current, but you may be able to get by without flats at all, particularly if you dither your images.
If you do decide that you need flats (eg if you have vignetting or a bright sky), take them with a fairly bright source so that you can use short exposures and then take one flat for every light, regardless of what the light exposure is - this will be overkill, but flats are easy to get, so why not. Suggest that you roughly half fill the histogram when taking flats.
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