Today I went to a client expecting only to get a half-day's money out of them. Nothing too arcane, just configuring SSL for IIS and then sorting out Outlook Web Access. But then there was a bit of "while you're here can you look at this..." going on and it turned into a whole day: hunting down and killing spyware, installing a couple of printers, advising on the pros and cons of MS Terminal Services and so on. Looks like there might be some more work in the offing later, converting a database from Excel to Access.
Tomorrow I'm going to muck around with Linux on a Macintosh, hoping to achieve some sort of balance. It won't be chargeable, though.