HOW LONG

Arabic 

كم (how much). (various references)

Breton

pegeit. (various references)

Dutch

hoelang, voor hoelang. (various references)

Esperanto

kiom da tempo, kiel longe. (various references)

Finnish

kauanko. (various references)

Flemish

hoelang. (various references)

French

pour combien de temps, combien de temps. (various references)

German

wie lange der medizinisch erfaßte Partner bereits infiziert ist (how long the index case has been infected), seit wann? (how long since?). (various references)

Greek 

πόσο καιρό. (various references)

Hebrew 

עד מתי (until when), עד אנה, עד היכן (how far, till when). (various references)

Hungarian

mennyi ideig fog tartani? (how long will you be over it?), meddig tart a szabadságod? (how long does your leave last?). (various references)

Italian

quanto (how much). (various references)

Japanese Kanji 

何時から (since when), 何の位 (how far, how much), どの位 (how far, how much). (various references)

Japanese Katakana 

どのくらい (how far, how much), いつから (since when). (various references)

Pig Latin

owhay onglay.(various references)

Portuguese

quanto tempo. (various references)

Romanian

cât timp vã trebuie? (how long will it take?). (various references)

Russian 

сколько (how many). (various references)

Spanish

tiempo que lleva el caso indice infestado (how long the index case has been infected), cuánto tiempo necesitara? (how long will it take?). (various references)

Turkish

ne kadar (how, how many, how much). (various references)