depends on my work - sometimes 30gb down to 5gb - mostly its about 20gb. When I finished my work I save it to our server.
The bug appears at any status of free hard drive space.
What I didn't mention is that the computer sometimes can not shut down after that illustrator issue. The screen becomes grey like on a normal shutdown but it won't ever end. Finally I have to crash the system completely.
What I wonder about is that neither a program update nor a system update could fix it. Is it possible illustrator doesn't like my hardware - the SSD maybe?