This is impossible to answer, but remember Bamboo is a grass so it could be very long.
This question is unanswerable as it depends on which type of grass you mean.
Do you mean a Blade of grass.
The longest song ever in the USA was 75 minutes
Hachrt
The longest fingernail ever was...
The longest snake ever found was a reticulated python that measured 25 feet (7.67 meters) long.
longest ever
18.7 in
47.22 seconds
Cows will eat long grass. Haven't you ever heard, "The cow's in the corn?" Corn is a tall grass.
The longest ruler ever recorded was 363 feet long. It was made in 2015 in Chicago, USA, to commemorate the opening of a new museum.
the longest jumprope is where about 80 people can jump in at the same time imagine that! really long!!!!!