Re: Support Contract?

I would bring the subject up with the powers that be, posing it as a problem and asking them to provide a solution. Explain that this has developed into more of a commitment than either of you had anticipated, that it has the potential of displacing some of your other work, and ask how they would like to handle it? If you don't get the response you need you could then be the one to ask if it would make sense for you to bill by the hour for your services. Keep it light and non-threatening and most people will do the right thing.