According to clause 12, how many working days does the engineer have to issue a provisional payment schedule?

To accurately determine the number of working days the engineer has to issue a provisional payment schedule according to clause 12, we would typically refer directly to the relevant contract document governing the project. Clause 12's specific language will outline the timeframe stipulated for the engineer's actions regarding provisional payment schedules.

In general practice, such clauses often state periods in which the engineer must respond, for example, 7, 14, or 21 working days, depending on the nature of the project and contract terms.

Without the exact text of clause 12 available for review, I recommend checking the specific contract documentation related to your project for the precise number of days mandated. If you have the text from clause 12 or any additional details, I could provide a more detailed analysis.