as soon as possible; as quickly as possible; ASAP
A polite but direct request or statement of urgency; slightly softer than できるだけ早く. Commonly used in both spoken and written Japanese.
See also: なるべく
Please reply as soon as possible.
I'll finish it as quickly as I can.
Standard kana-kanji mix; the most natural and common spelling.
Kanji form for 成るべく is rarely used in modern writing; mostly seen in older or formal texts.
Phrase composed of なるべく (adverb meaning 'as much as possible', from the classical verb 成る 'to become' + べく 'should') and 早く (adverbial form of 早い 'early, fast').