24h definitely. Ananas is not so commonly used, but in informal speech, yes, as pineapple is also ananas in most of the EU languages (not in Spanish).

Fruit regulation would typically use a more formal (sub)species nomenclature like 'Ananas comosus'.

Spanish too, just not in Spain.

Only in a few countries representing a minority of speakers.

Bear in mind that it's still a perfectly valid word in Spanish. Such as "babuchas" to say sneakers/trainers in Andalusia.