There are plenty of amateurs using actively cooled specialized astrophotography cameras with total integration times reaching hours (2-3 are typical).
Readout noise can be cancelled by taking so called bias frames. Shorter exposures are sometimes preferable because of the light pollution and to minimize the possibility of an exposure being rendered usles by some plane or satellite: it is less painful to throw away three minutes of exposure time than 15.
> Readout noise can be cancelled by taking so called bias frames.
That’s not what bias frames [1] are doing. Bias frames measure a systematic effect in the conversion of stored charge to a digital number in the CCD device. You can then subtract it out.
The calibration offered by bias frames does not fix readout noise, which is a random, not systematic, effect that is inherent in the same conversion.
You can use the bias frames to compute the strength of the readout noise (i.e., the rms magnitude of its random part) but you can’t remove the random noise itself.
The point of bias frames is what you take them without accumulating any charge. Well yes, you cannot eliminate random noise, but you can reduce it.
Also, most popular deidcated astrophotography cameras are now CMOS not CCD and readout differs in these.
Your link does not work, and probably for the better. See this instead: https://www.youtube.com/watch?v=O6oGyFlZgAc
