When you are working with professional video formats its always good to know estimated file sizes. Files are pretty big - up to 2 GB/minute for FullHD 1080p 30fps video.
There is pretty nice Omni Video size calculator where you can compute size of most common professional video formats such as AVID, Cineform, DNxHD, ProRes, REDCODE, DVCPROHD. Note that very common DNxHR codec is not included.