I don't know the original term used, but in greek the same word translates to "several" and "some": https://translate.google.com/#view=home&op=translate&sl=el&t...

So could have been "some days' voyage".

Correct. Sailing the Atlantic back then took over a month.

12 days was only achieved in 1905, and the official route is far shorter than a sail from Carthage.