Getting exact times in Doom demos?

Andrey Budko's PrBoom modification allows one to see the completion time for each level to the nearest 1/100 of a second.

Is there a way to get down all of them in a multi-level demo without playing the whole thing?

I'm not sure, but I think there are versions of timer.exe that can do this. I'm not sure if they are publically available though.

Here is a relevant link, but it doesn't yield a very clear answer.