Three or four a week is fairly typical for older homeschoolers, more for children still in picture books. See who can intrigue another into reading a favorite book. Teens aren't too old to be read to in the late evening hours. Besides, some great books are just meant to be shared. I do look for book reviews and other reading lists, just to give our son ideas of books to look for.
Some lists have search engines , handy for looking by age and interests.
On this page I've included some commercial links. I have no business interest in these companies, but have liked surfing through their reading lists. I hope you will, too. New homeschoolers need some time to read the great literature written for younger children. Conversely, don't be concerned if your child seems to be selecting books that have a vocabulary that would make a graduate student faint.