限り

The word 限り is used to refer to something that is the case, or something that holds true as long as the condition X holds true. It's also used to indicate the extent to which someone can do something. Translations include "as long as", "as far as", "while", "until", "unless", and "as much as."

私の知っている限り、外国人が使いやすい日本語の辞書はないんですよ。
As far as I know, there is no Japanese dictionary that is easy for foreigners to use.

コックである限り、美味しい料理を料理しなくてはいけないんだよ。
As long as you are a chef, you must make delicious food.

プレイスメンとテストに合格しない限り、上のレベルのクラスには入れません。
Until I pass the placement test, I can't get into the higher level class.

明日までにこのレポートを翻訳するのは結構大変ですが、できる限り頑張ってみます。
Translating this report by tomorrow will be pretty difficult, but I'll do my best, as much as I can.