If you're looking for synonyms for "long," here are a few options, depending on the context:
* Lengthy: Used for things that take a long time, like speeches or books.
* Extensive: Used for things that cover a wide area, like a long road or a large field.
* Prolonged: Used for something that lasts longer than expected.
* Tall: Used for something that stands high up.
* Deep: Used for something that extends far down.
Can you provide more context about what you're trying to describe? I can give you more precise options then.