Generally, it takes 4-6 months for grass to totally fill in. Proper watering and fertilizing will insure quickest growth.
Irrigation is highly recommended, though not totally necessary if you make sure seeds or stolons are watered properly throughout process. We do offer temporary irrigation rental at very reasonable rates.
Topsoil is also highly recommended for quick rooting and growth. As long as seeds or stolons are watered they will grow, but topsoil help a lot, especially in the beginning stages.
All labor is included, from spreading stolons, to hydroseeding, or hydromulching, and clean up. There is a set price for temporary irrigation as well.