Article 1721

If, in the execution of the work, an act of the employer is required, and he incurs in delay or fails to perform the act, the contractor is entitled to a reasonable compensation.

The amount of the compensation is computed, on the one hand, by the duration of the delay and the amount of the compensation stipulated, and on the other hand, by what the contractor has saved in expenses by reason of the delay or is able to earn by a different employment of his time and industry. (n)