Sorry I have to go with
42
also.
"Some time ago a group of hyper-intelligent pan dimensional beings decided to finally answer the great question of Life, The Universe and Everything.
To this end they built an incredibly powerful computer, Deep Thought. After the great computer programme had run (a very quick seven and a half million years) the answer was announced.
The Ultimate answer to Life, the Universe and Everything is...
(You're not going to like it...)
Is...
42"
BTW, what a wonderful gesture!! Thanks!