不知凡几 Countless
Explanation
凡：总共。不知道一共有多少。指同类的事物很多。
Fán: In total. Doesn't know how many there are in total. Refers to a large number of similar things.
Origin Story
话说唐朝诗人杜甫，喜爱饮酒作诗。一日，他与友人相约畅饮，席间诗兴大发，一首接一首地吟诵。友人惊叹杜甫诗作之多，不禁感慨道：“杜兄诗作之多，真是不知凡几啊！”杜甫闻言哈哈大笑，又续写了几首，说道：“今日诗兴正浓，岂止不知凡几，恐怕更多呢！”于是，众人继续饮酒作乐，欢声笑语不断，杜甫的诗篇也如泉涌般倾泻而出。直到夜幕降临，众人才依依不舍地散去。杜甫的诗歌流传至今，其数量之多，确实令人惊叹，足以印证“不知凡几”的含义。
It is said that Du Fu, a poet of the Tang Dynasty, loved drinking and writing poetry. One day, he made an appointment with a friend for a drink, and during the drinking session, he was inspired to write poems, reciting one after another. His friend was amazed by the number of Du Fu's poems, and exclaimed, "Brother Du, your poems are truly countless!" Du Fu laughed heartily and added a few more poems, "My poetic inspiration is so strong today, it's not just countless, I think there are even more!" Thus, everyone continued drinking and having fun, with laughter and cheers, and Du Fu’s poems poured out like a spring. Only when night fell did everyone reluctantly disperse. Du Fu's poems have been passed down to this day, and their sheer number is truly amazing, enough to confirm the meaning of "unknown number".
Usage
用于形容数量很多，多得无法计数。
Used to describe a large number, too many to count.
Examples
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他收藏的邮票不知凡几。
ta shoucang de youpiao buzhi fanji.
He has countless stamps in his collection.
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会议上，发言的代表不知凡几。
huiyi shang, fayan de daibiao buzhi fanji
At the meeting, countless representatives spoke up.