Fujitsu Tablet 600 (P3-500MHz) with 256MB RAM. From hitting power button to full Windows XP desktop with hourglass disappears is 38 seconds. Shut down takes 5 seconds from hitting the power button. Hibernate takes 9 seconds.
The BIOS loading takes a while, almost 20 seconds so Windows portion loads pretty quick given the speed and RAM of the tablet. Unfortunately Centrafuse takes about 20 seconds to start itself.