Why do you need 30min worth? and is that real time IE; 30min@24frames/sec ? OR 
    do you want Time lapse?
    What resolution are you after? NTSC/PAL, 720, 1080?
    Justin's right just use a loop any 30min file at a reasonable quality would be huge



What type sky are you after sunny, coloured, stormy? You might be best posting a photo


I try and help if I can ~ Peter


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