There are numerous ways to replace the phrase "long hard look" in writing. For instance, you could replace it with "intensive scrutiny," which brings forth the sense of deep examination. Another synonym could be "rigorous inspection," which emphasizes the seriousness of the assessment, or "thorough examination," which implies a comprehensive evaluation. "Prolonged gaze" is another option, which indicates a sustained focus and attention. You could also use "detailed survey," "careful study," or "meticulous observation." All of these synonyms give a similar impression to the original phrase yet help diversify your writing and make it more compelling for readers.