thanks for the answer Jarozila. Not as long as I expected.
I was considering this a couple of months back but was put of by the trim on the doors. If I'm going to do it it has to be right, or I wont do it at all.
Now that I know that I should be able to do the doors in a weekend I am putting this on the list of things to do.
It's never too late to have a happy childhood