多长时间都没关系。

It doesn't matter how long it takes.

Traditional: 多長時間都沒關係。
Pinyin: Duō zhǎng shíjiān dōu méiguānxi.
Pinyin (Taiwan): Duó zhǎng shíjiān dōu méiguānxi.
Bopomofo: ㄉㄨㄛˊ ㄓㄤˇ ㄕˊ ㄐㄧㄢㄉㄡㄇㄟˊ ㄍㄨㄢ ˙ㄒㄧ。

Where this sentence is used

How to use 没关系 (mei2 guānxi) in Chinese: it doesn't matter, not related to

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