What spend does a restaurant ad need in order to be readable?

What is needed is enough that, in the radius of the door and on that shift, the piece is seen and someone can book. The figure the platform marks is not needed if with less the messages already arrive and are answered. Look for a week at whether there are messages before raising anything. A minimum is chased and the booking link is still broken. The week of messages beside the spend, and the decision to continue or stop.