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I certainly agree with you that 70 minutes is the absolute maximum that I would recommend. Much more and you run the risk of the final tracks sounded like gibberish, skipping lines, and doing other rude things. But don't take our word for it, experiment, and report your observations.

Again, I agree that the CD blank, the gape between tracks, and the reader are also variables. What I hear well on my home CD player is sometimes gibberish on the CD player in my van. The recent Mudcat CDs This Is Us are a case in point.

Cheerily,
Charley Noble