Water lawns to be serviced, for a period of (15) minutes the evening before service. Remember (15) minutes is plenty. In this case less is more. An over watered lawn makes it difficult to aerate a lawn properly. If your timer is set to water in the morning, that's ok too.
Post- Service
Water for the next (2) days after service. This facilitates the introduction of nutrients into the root system, creating a healthier, greener, thicker looking lawn.