I'm familiar with this one, so will not post
solution cause I know it!
Couple questions aimed at further reducing time:
If you cut a slice in half and put a half on
each side of toaster, will the toasting be in
15 seconds...or still 30 seconds?
Are you allowed to put the butter close to
toaster so the heat from toaster softens it,
thus cutting down the 12 seconds buttering