What is extremely long for you? KRC1 normally works on a Win95 basis so it will take quite a while.
If you are in a rush you can get rid of the batteries and power off will shorten a lot, although I wouldnt advice it.
how frustrated ? ($$$?)
you can upgrade to KRC2 or - avoid booting...
Get its Maintenance done, spares etc. KSS upgrade. = Temporary Solution.
Permanent Solution = Switch to KRC2ed05 [new/used] or KRC4.
Upgrade ram and change HDD to solid disk.
Problem with floppy disk or - and CD.
Use bios and switch off driver for floppy disk. Also switch to "only C" disk drive to boot up system.
Windows are waiting for floppy to respond but there are not communication so floppy delay process of boot up windows and the rest Kuka drivers.
If your LED is constantly green on floppy drive even no floppy is inserted that would be very good indication about described problem with floppy disk drive.
Of course everything can affect boot up speed as other mention here, but check floppy as well it is quite common problem with KRC1 today as floppy and CD disk drivers aged not so gracefully comparing to mechanic of the robot.
