I usually overestimate the number of days it will take to complete something to try to cover contingencies, but I don't think that would work in your line of work, with all the expenses involved.
If I had said, no, we need Feb 25, 26, 27 to be sure we get it all, we'd be fine.
Instead, I said, we can do it all in two days on Feb 25, 26, so she booked a flight on the evening of the 26th for recording on the 27th in Chicago. Then, because of a previous commitment early in 2012, Rob's got a workshop that week which means he can only record the singers in the evening, but because Judy's flying out on the 26th, we don't have two nights to record! Because of the actor's commitment, we don't have him for the 26th at all.
And all because I said we could do it in two days.
Damn, damn, damn!