It'll be a bit longer than that. I'd predict 4-6 for the Gigabeat if we could flash the bootloader, and still about 3-4 if we chose to flash Rockbox directly.. Your disk is already spun up by the time it least the Gigabeat splash, and when the Gigabeat splash disappears, the Rockbox bootloader has already run (the RB bootloader doesn't update the screen, so the splash won't vanish until you pass it into Rockbox, if I understand correctly).