Closer the better.
My one story on this.
Some years ago when my father still had his mind intact, he and I went on a fathers day trip in the Collings Foundation B-24.
First flight of the afternoon. The young man who was the flight engineer asked for a volunteer from the nine of us who had paid for the flight.
No idea why, my arm goes up.
My task was to pull the props through on the right side while he did so on the left.
Nine pulls each engine.
On the second, the pilot turned on the electrical, which made the pumps in the engine wind up.
That really scared the *** out of me. Seriously.
The payoff was that I got to sit in the RO seat for take off, and later go sit up front in the turret, crawling over the still revolving nose wheel.