Water 3x per day - breakfast, lunch, and dinner. Assuming 1 inch per hour you only need to water for 10 minutes each time. That means 1/6 to 1/4 inch. All you're trying to do is moisten the sod to the roots, not soak the underlying soil. Do that for about 3 weeks or until the roots have knit into the soil. Test by lifting a piece of sod. If it lifts, the roots are there yet.

After 3 weeks you can start to back off on frequency and go up on duration. Ideally the starting point for mature lawn would be 1 inch per week applied all at one time. If that appears to be too much, then stretch it out to 10 days for 1 inch. Once mature, if the grass withers before 7 days are up, water immediately but water a little longer to try to stretch to 7 days.

The reason for infrequent watering is to develop deep, drought resistant roots. Second reason is to prevent weed seed from germinating. Weed seed needs the same constant moisture as you gave the lawn when getting the sod to knit. If you withhold water for long enough that the soil surface dries out, then the weeds won't sprout.