What is the longest poem?

Difficult ~ Your question is not very rigorous-because you didn't make the concept of "sentence" clear ~

A sentence in an ancient poem often consists of two couplets. In this case, the four-line or seven-line sentence is 14, which meets the requirements ~

As for words, I just looked them up in the dictionary. Although there are differences between ancient and modern sentence breaking standards, the characteristics of the word itself determine that it will not have too long sentences. ...

But Qu is different (in fact, Qu is also a kind of poetry), and the rules of Qu are very broad, so you can add words to the established score at will. I found a longer one:

Wang Shifu's Out of Order;

Seeing the arrangement of horses and chariots, I can't help being boiled.

How are you feeling? Flowers are so charming, so charming.

Prepare a pillow and go to sleep in a daze.

From now on, shirts and sleeves will be covered with overlapping tears.

Killing people is not boring,

Killing people is not boring!

After a long time, the letter in the book came to me trembling.

The sentences in Guan Hanqing's representative works are said to be notoriously long in Yuan Qu. Maybe this is what you are looking for:

[Yellow sand]

I can't steam, boil, pound, fry or explode like copper peas.

Son, who taught you to get into his hoe and keep cutting, but you can't untie it and take off that slow tie?

I played Liang Yuanyue, drank Tokyo wine, enjoyed Luoyang flowers and pulled Zhang Tailiu.

I can also recite poems, seal pens, play silk and taste bamboo. I can also sing partridges, dance, fight, play cuju and play backgammon.

You just lost my tooth, crooked my mouth, crippled my leg and broke my hand. Heaven and I have such bad symptoms, and you still refuse to rest.

It's a pity that the prince ordered the ghosts and gods to hook themselves, and three souls went to hell and seven souls lost, so they didn't take the fireworks road during that time.

As for "colorful" modern poetry, I don't know. If you are interested, you can write a poem within 100 words.