P45 Medium Format Noise

Owners of DSLRs with CMOS sensors may not consider it a big deal, but CCD chips, such as those used in medium format backs, have (until now) had difficulty with long exposures. And by long exposures I'm not talking about minutes. I'm talking about seconds, and in many cases even large fractions of a second.
No, this is not hyperbole, as owners of some MF backs will confirm. A second or two has been the limit for many, and a few even start to get blotchy and noisy at anything more than 1/4 second. But, that was then, and this is now. With the P45 the magicians at Phase One in Copenhagen have pulled a rabbit out of a hat, in this case a long exposure rabbit.
When I purchased my P45 (an upgrade from a P25) my dealer told me that one of the improvements that Phase One had made was in long exposure times. This was confirmed by my friend Kevin Raber, Phase's US VP Sales and Marketing. He told me that the factory was claiming that exposures of as much as30 minuteswere possible.
Needless to s...