Ditto ... window heat off (if a factor), set for a 10K' cabin, over to STBY and descend to reduce diff P (73 classics) ... no dramas, no great urgency, just keep an eye on it. Is it worth increasing the rate of ascent of the cab to relieve the pressure quicker? For 5PSID (-3psi) probably not, would only save a minute or so unless you
really wanted to alarm the pax. For 2PSID (-6psi) might consider tweaking it up a little - depends on the window in question.
Would prefer not to turn the cabin into a rubber jungle, but if one wanted to be cautious, either (or both) could pop a mask on if the crack appeared to be spreading ... that or take the time to clean it first ... eeeww ...
Having said that I'd probably finish my coffee, put the paper away and take the paperwork off the glareshield ... as much as one wants to, I hate losing paperwork.
