Mine doesn't seem to do that.
Maybe you're not looking hard enough?
Seriously: I had to search too. Here's what i found: Look for a line like this:
ID 0 (H:) PLEXTOR DVDR PX-760A V1.06 TLA:0006 (S/N:xxxxxx) [B]([I]3.57.17[/I]D - 16.20.48D)[/B]
The bold part are the total times for CD and DVD in Hours.Minutes.Seconds (or the other way round, just burn something and compare the numbers afterward, you'll see the change). Don't ask me what the D stands for. I've seen A's and B's too.