Casual — to friend
Laundromat
洗濯終わるまで何分かかるかな? — How many minutes does it take until the washing is done? (Laundromat, Casual — to friend, JLPT N4)
You
洗濯終わるまで何分かかるかな?
せんたくおわるまでなんぷんかかるかな?
How many minutes does it take until the washing is done?
Romaji: Sentaku owaru made nanpun kakaru kana? / Reply Romaji: Ato jugofun kurai de owaru yo. Taima kaketeru kara daijobu!
Reply
あと15分くらいで終わるよ。タイマーかけてるから大丈夫!
あとじゅうごふんくらいでおわるよ。たいまーかけてるからだいじょうぶ!
It'll be done in about 15 minutes. I've got a timer on it, so don't worry!
Gesture & etiquette
Glancing at the washing machine display while giving a friendly smile.
Avoid being overly formal or using polite business Japanese as it creates distance between friends.