Have not done repositioning, but have done transatlantic crossing on the Princess Royal and it was excellent.
However, your main request refers to the number of days at sea. In our case it was seven (7) and for me it was too long, I got bored even though the weather was excellent. On the other hand my other half loved every moment of it, so it's really to each his own I guess. I would definitely go again, but this time I would make sure I had a tablet with games and the ability to down load books.
The crossing was truly amazing from the fact that we were at sea for seven days and never saw another ship, never saw a plane, nothing - and it really brought home to me how vast the Atlantic ocean is.
I should add that we stopped in Madeira which was absolutely wonderful. Well worth a visit.
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