motorhaven - 9:31 pm on Oct 6, 2012 (gmt 0)
I don't know if its standard, but its not uncommon in professional fields. I expect the courtesy of a two week notice when someone quits, to give me time to prepare so I extend the same courtesy when letting someone go. But its a personal decision if they merit it or not, how long they've been working for you, etc. and whether its something you can reasonably afford.