For length (distance, time, etc.):
* long: This is the most common and general word for "long".
* Example: "La route est longue." (The road is long.)
For duration:
* long: This can be used for duration too, but there are other more specific options:
* longtemps: This means "for a long time".
* longue durée: This is a more formal expression for "long duration".
For other meanings:
* long: This can also mean "tall", "lengthy", "detailed", etc. depending on the context.
Here are some examples:
* Longtemps: J'ai attendu longtemps. (I waited for a long time.)
* Longue durée: Ce projet a une longue durée. (This project has a long duration.)
* Longue: La robe est très longue. (The dress is very long.)
It's important to consider the context to choose the most appropriate word.