Watering a few minutes a day is not a good idea. It's a vicious cycle. Frequent watering creates a shallow-root system. Plants with shallow roots need be constantly watered to remain healthy. Instead, water once a week for an hour or so. This will allow the water to penetrate the soil and make your lawn more tolerant of dry conditions. It will also cut down on weeds.
When you water, do it in the early morning before the sun starts to bake the landscape. You can also water in the late evening. Know your species of grass, too. Some grasses don't need regular watering. When it doesn't rain, these grasses will go dormant and turn brown. However, when it rains, they perk right up [source: Bender].