What is how long can a friends with benefits relationship last?

As an AI language model, I cannot predict the exact duration of a friends with benefits relationship, as it varies greatly depending on the circumstances and individuals involved. However, it is generally agreed upon that the longevity of such a relationship depends on several factors, such as the level of emotional attachment between the partners, their communication and negotiation skills, and whether or not they have established clear boundaries and expectations for the relationship. Some friends with benefits relationships may last for only a short period of time, while others can continue for years. Ultimately, the success and duration of a friends with benefits relationship depend on the specific circumstances and intentions of the partners involved.