When describing the size or dimensions of something, we often use the phrase "in length." However, there are various synonyms you can use instead to avoid repetition and add more detail to your writing. You can use terms like "long," "stretch," "extent," "measurement," "size," "distance," or "span" to convey the idea of how long something is. Additionally, you can use more specific terms depending on the context, such as "height," "width," "depth," or "breadth." Using synonyms not only enhances the clarity and elegance of your writing but also helps to avoid redundancy and make your text more engaging.