There have been long darks run by the Beta Testers on Cloudy Nights. ZWO offers a 5 minute dark link on the product page for the 1600. I have run 5 minute darks myself to check on the rumoured long dark Amp Glow, which i could barely detect at that duration. Amp glow was explored on CN. Since i don't plan on running longer subs it didn't really concern me, and Sam's (ZWO) attitude when asked on the forum seemed to be that it was not significant to be a concern and was easily calibrated out. I believe ZWO released a driver update that reduced the amp glow further.
The narrowband subs i have been running are 60" subs, and i don't know that i would be too concerned about 10 minute performance with this camera.
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