"Regarding clients wanting fast turn around, I have told all my recent clients that working with me is a min of 4 months for a finished product. This is partly to let them know up front that there is a LOT of work that goes into the product, and partly to give me room if something throws my schedule
completely off balance."

Not to mention "popularity, and demand for your product"

for corporates, timing is of the essense. Remember that what you charge them is a tax write off, so even thogh they may have a budget, in the end, it really doesnt matter.
Most corps ive done would not accept a turnaround which goes over 3 weeks or so. Usually THEY have a deadline, and i ususally give myself afew days before THEIR deadline and then set mine to that.

Gotta be really careul to only take on what you can, as if u bite more than u can chew (as Joe has explained) it could be the end of you..
Dont take on more than u can handle.. Ive made many mistakes in my time, but thats one which i wont..

Clarification
 

I should have clarified that.... I only tell the wedding clients that time line part. The corporate work always is the highest priority done before everythign else, because I know they have these sort of deadlines. I have a client now that is just to busy to create his voice over script, so I'm waiting for that and working on two wedding projects. But as soon as he gets the script hammered out from my time code render then I'll set an appointment ASAP and get it done so he can start using it to get more business and get positive feed back about the video from his clients.

jason