The answer is not the same for everyone. You may want to consider the following.
The frequency of washing your dreads can vary depending on various factors such as hair type, scalp condition, and personal preference.
Generally, it is recommended to wash your dreads once or twice a week.
However, some individuals with dreads may prefer to wash them less frequently, such as every two weeks or even once a month.
Factors such as lifestyle, activity level, and climate can also influence how often you need to wash your dreads.
It's important to find a washing routine that works best for you while keeping your dreads clean and maintaining their health and shape.
Pay attention to your scalp's condition and any signs of buildup or odor, as these may indicate the need for more frequent washing.
Experiment with different washing frequencies to determine what works best for your hair and scalp and adjust as needed.