If he has 45 hours then he's not going to be flying the instrument legs is he? Or is he planning it all VFR?
I don't think its the longest single engine flight, I think there has been more than one round-the-world flight in a single.
I've flown across the states and back so that must be around 8000 miles, and also from San Diego to Vancouver and back.
That was all in a single. I did 200 hours in one month doing it.
Perhaps I should reinvent myself - "Airbus Girl, the Explorer!"