The most efficient method (I think) is to put two slices of toast in the toaster for 30 seconds, then remove ONE of the slices and replace with a new slice, and turn the other slice over. Toast for another 30 seconds so that one slice is toasted on both sides and the other is toasted on one side. Remove the completely toasted slice and replace with the other slice that is toasted on one side and turn over the slice that is still in the toaster, then toast for another 30 seconds and all your slices are done.
So the time taken is 30 + 5 + 5 + 3 + 30 + 5 + 5 + 3 + 30 = 116 seconds or 1 min 56 seconds.
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