* μακρός (makrós): This is the most common and general word for "long" referring to length, duration, or distance.
* μήκος (mḗkos): This is a noun meaning "length." You might use it in phrases like "το μήκος του ποταμού" (to mḗkos tou potamou) meaning "the length of the river."
* έκταση (éktasi): This word means "extent" or "extension" and can be used to describe something long in terms of space or time.
* Words describing duration might also be used, depending on the context: For example, πολύς (polús) meaning "much" or "many" could be used to describe a long period of time (e.g., "πολύς χρόνος" - polýs chrónos - "much time").
The best translation will always depend on the specific situation.