And you thought your old Windows laptop took a while to restart. In our testing, the BlackBerry Z10 took well over a minute to cold boot. The AT&T version took 1:55 and the Verizon model 1:43. By comparison, the iPhone takes 25 seconds. It gets worse. The Z10 then proceeds to prepare the BlackBerry Hub for another minute or so, during which time your inbox is inaccessible. That is nuts.