A owes B. B assigns the credit to C. B is in good faith. It was greed that B would be responsible for A’s solvency. The parties did not agree on the duration of the liability. If the debt was due July...

A owes B. B assigns the credit to C. B is in good faith. It was greed that B would be responsible for A’s solvency. The parties did not agree on the duration of the liability. If the debt was due July 6, 2019 and the assignment was made August 8, 2019. Until when is the guaranty?