From: Kitchen Hints and Tips - Buttering Bread Fast
If you are having a large get together [sic] and you need to make a large amount of bread that needs to be buttered you may not want to spend the whole afternoon buttering each piece.
Instead you can microwave the butter for about 20 seconds, stir it and if necessary microwave again at 10 second incriments [sic] until melted.
Now all you have to do is pick up a pastry brush and paint the bread!
Has anyone actually tried this? Is it that much faster? It doesn't sound faster to me. You're still touching each piece of bread once.
I've never tried this before, but even if this method takes, say, about half as long to do butter one piece as opposed to spreading, it would be the difference between O(n) versus O(n/2). Which, if you're buttering a royal whopping buttload of bread, would actually make no difference at all.
But the question is, would 'n' ever be so large such that the two methods end up taking the same amount of time? IOW, how royal and how whopping would the buttload have to be?
The Computer Science degree has messed up my idea of "faster".