how long for grass to grow
It depends on the type of grass seed that was used. Some such as annual rye will germinate very fast in as little as 7 days while grasses such as Kentucky blue grass may take up to 21 days to germinate. Tall fescues will take 10-14 days to germinate. It also depends on the time of year you sow the grass seed. Ground temperatures are what determine germination rates.