I've been working on this for a bit SBIG STF-8300M, with filter wheel and ST-i OAG 8" Ritchey-Chretien on an iOptron IEQ45 pro mount 6.3 hours each RGB (2 minute subs) 16 hours Luminance (5 minute subs) For a total time of approximately 35 hours https://www.astrobin.com/full/272621/0/