无所谓短暂无所谓长久
[wú suŏ wèi duăn zàn wú suŏ wèi zhăng jiŭ]
Doesn't matter if it's short or long-term. This phrase indicates a kind of detachment and nonchalant attitude about things' durations, reflecting that either brief or enduring experiences do not significantly affect oneself emotionally or mentally.