Water by soil moisture, not by calendar. Dry soil means a dry lawn — and the top 10 cm of soil is what matters. The simplest gauge is a 15 cm timber stick. Push it into the soil, leave it a moment, pull it out. If the bottom 5 cm is dry, water. If it's moist, you can skip.
After a few cycles you'll learn the rhythm of your soil and set your own watering schedule. As a rule, water before sunrise or after sunset — early morning is the strongest single window. A garden sprinkler works fine, but automated irrigation is better: it runs at the same time every day, so even if you're away, the lawn keeps its rhythm. That consistency adds real years to the life of the turf.
