put out a rain gauge to measure the water coming out of your hose or irrigation system and then figure out how much time it will take to water .75"-1.0" each week.  I like to water 1/4 of an inch four times/ week.  I find this works great.  I would recommend watering longer, fewer days rather than increase the watering to every day but water less.  The reason is that you want to soak the root area.  If you water 7 days a week just a few 10ths of an inch the water may never reach the roots and that is your goal of course.

If you don't have a rain gauge a metal tuna can works great.  A filled can is about 1" of water.  Put the sprinkler on and let it run for 30 minutes.  If the can is 1/2 full it will take you an hour to water 1".  Give it a try.  You might discover you are overwatering your lawn, lots of people do.