I am planning to seed my new lawn in the very near future. I have approx. 42,000 sq. feet. I am going to be out of town the last week of July. Should I seed now or wait until I return? My concern is: will the seed have time to germinate in three weeks? I will not be able to water it while I am out of town will it stand the 9 days without water if it doesnt rain? Thanks.