how to check size before burning with growisofs

Hello. Is there a way to tell how much would be appended when I burn a 
multi-session disk with growisfs?

I could use -dry-run but it doesn't report the size before writing.

I could not use grace time because growisofs doesn't have this parameter.

I could use 'du -sh' but that counts in the files which -old-root 
parameter decide to not to write again.

Usually the only way I can tell the size to be written is to look at the 
first percentage reported by growisofs, but by that time it is already 
too late to regret. If growisofs start with 60%, I know the data to be 
written is 4/6 of the data already on the DVD.

Thanks.


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