Well, "it ain't rocket surgery" so here we go.
Water your lawn in the morning. Preferably between pre-dawn (that might be a job for those with timers) and about 10AM
Water deeply (put heaps of water on) two or once or twice a week to maintain a healthy roots system and build water stress resilience (tough lawn, not weak sickly lawn)
That's it. They are the basics. Water big and seldom and water in the morning. Your lawn will be healthier, you will use less water, and your lawn will be more resilient so when you go away for an Australia Day barbie, you won't be inviting the Browns to come and live in your front yard.
And that is how we like it. Short and simple.