I've never had any other kind of setup.

You'd want at least 2 GB for RedHat 8, though. Preferably 5. Especially since you'll be able to read (with some work) but not write your NTFS partitions. So, basically, you can't download something in Linux and have it still be available when you go into 'doze, unless you create a fat32 partition for inter-OS sharing.