How many times should I use a towel before washing it?

Good afternoon, I have a question regarding hygiene practices, specifically concerning the use and washing of towels. Could you please elaborate on the recommended number of times a towel should be used before it's washed? I understand that this might vary depending on factors such as personal usage, material, and level of cleanliness desired, but I'm interested in a general guideline to follow. Thank you for your time and expertise.