I couldn't find specific salary data for part-time content writers or specialists on Glassdoor. However, it's common for part-time content writers to earn anywhere between $20 to $40 per hour, depending on their experience, location, and the complexity of the work.
For a more accurate estimate, consider factors like your specific skills, the industry you're targeting, and whether you have a portfolio that showcases your writing abilities. If you're looking for a more detailed comparison or specific job openings, let me know!