Surely it depends how long you want the finished product to be.
You could do a bloody snooker cue with a nib at one end and a litter picker at the other.
Did your mandrel maker not make it the length of the tube?
Then add whatever you want to part it off.
I make handle for prestige saucepans the longest being 5 and 1/2 inches.
I stick a 2 foot baton on and turn 4 at a time then drill them afterwards.
Quicker than doing them individually, not relevant I know but my point being allow enough for the chuck plus a bit for rounding and parting off.
