24 if that was the question.
this is after 2 hours
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Something else going on. Hard to guess without details.
Some suggestions... and answer at least the 16 questions at the end of the Wiki article.
First guess: OE or hardware.
OK...I am new to PR (obviously) --- here is what happened
I am used to working in Vegas where I just grab averythin in a bin and drop it on the timeline.
what happend in PR is the P2 media comes in to the bin and and spanned clip names are repeated -- therefore, I had to look at WHAT i was dragging in (i was draggin in all the repeated instances of clips and PR was not allowing)
I've had Timelines up to 8 hours, with no difficulty, using DV-AVI's in an NTSC DV Project w/ 5.1 Master, 28 Audio Tracks and 16 Video Tracks.
IIRC, Harm's answer of 24 Hours is correct.
Something is going on with either your system, or your Project.
To get the most out of your computer, this ARTICLE might be helpful.