I would not be so sure, within the last year I watched a fairly well known IT in Asia who teaches many tech instructors show at a consumer show slides of he and his team drying out sorb on sheets on a remote expedition.... so they can repack. I actually was alarmed enough to approach another local IT and ask him to explain why it was a bad idea, he passed.
If I may ask, was that IT from Hong Kong?
As for Kensufs question re time on stack, genearally circa 11 hours on my mk15.5 scrubber (4.2kg / 9 and a bit lbs), occasionally a little more when shallow diving,, and did so habitually for 12 years on that unit with never an I'll effect. Well probaly 10 years actally, as it took a couple of years to work up / feel comfortable with that level of usage. Almost all in warm water though, and mostly in the 50 to 70m range during the later two thirds of that time, as deeper wrecks were simply not available (for deeper dives) in the areas where we were operating during that time. Of course if I knew / thought the 'next' dive was going to be strenuous on the bottom, I would change out at 9-10 hours, that being dependent on run time for upcoming dive though.
As for keeping a partially used sealed scrubber, I would, when not out on an expedition, somtimes have to go for weeks between dives (unfortunarely), and again, never encountered a problem with that 'storage' procedure, i.e. sealing the packed scrubber, but with airtight screwed on fittings in the 15.5's scubber's case, not just inside a so-called 'sealed' plastice bag for that time. On the other hand, I certainly would
not empty the scrubber to dry out the sorb - as mentioned in above quote - at any time!
However, my above re scrubber time usage is not to be seen / taken as a recommendation by any means, just a truthful answer to a question is all.
EDIT: To those not familiar with the scrubber in a mk15.5, there are some very good photos here - SM1600 - although in this instance the mk15.5 is called an 'SM1600', which simply denoted the Pete Ready / Kevin Jurgensen electronics version (of the 15.5) so to speak. The case, cylinders, scrubber, and almost all other parts, are identical.