What's the duty cycle of a DVD burner?

As in, how many discs should I burn at once in a row before letting it cool down?
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  1. I usually burn one right after the other, or read one after the other (in the case of ripping tracks) and I've gone 10 deep and never had a problem. I don't suspect that repetitive use is a problem for burners, although I could be wrong.
  2. Just googling, here is a couple stats.

    HP dvd840 LightScribe 16X DVD:
    Mean time between failures (MTBF): 100,000 POH at 20% duty cycle in room temp

    ASUS DRW-1608P2S:
    MTBF: 60,000 POH, Operating Duty Cycle (Read) 20% POH, Operating Duty Cycle (Write) 2% POH.

    POH = Power On Hours

    I gues it really doesn't matter as they're $30, but I'm pretty sure I've already burned thousands of DVD's at a slow 4x (about 15 minutes to completion).

    Let me estimate 1500 burned DVDs at 15 minutes each = 375 hours.
    2% of 60,000 = 1200 hours
    But leaving the PC on 24/7/365 is only 8760 hours a year, meaning it would take 6.85 years to reach MTBF of 60,000 POH.
    As I've only had this PC for 2 years x 8760 = 17,520 hrs.

    17,520/60,000 = 29%
    375/1200 = 31.2%

    So I've used my write function more than I should have, going over the write duty cycle by 2.2%.
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