Web developers' working hours can vary depending on their employment type and specific project demands. Full-time web developers typically work 40 hours a week or more, depending on their workload and deadlines. Freelance web developers may have more flexibility in setting their working hours, balancing multiple projects, and accommodating personal schedules. However, they may also work irregular hours or more than 40 hours a week to meet client deadlines or manage their workload effectively. Ultimately, the number of hours a web developer works per week depends on their individual circumstances and the requirements of their projects or employer.