hmm not sure but don't think so. I believe RealPlayer finalizes the cd after burning, so you cannot add more afterwords.

There some applications that allow you to add after burning, but they don't finalize the cd.

Nero or Roxio both have this feature. You may search the internet for other programs that may do this also.

I think the 25 minutes left you refered to was the amount of space still available for that burn so you wouldn't go over the maximum size of the cd for that burn.