Ask your child to make a prediction of what might happen next. These are only some suggestions. Any activity you do in conjunction to reading books with your child, will add to your reading time. There is no rule that says there is a magic time that is best to read with your child. Any reading time you spend with your child will enrich their learning.
Some parents like to read to their children right before bed.
This could be a good winding down time with your child. Another time might be right after supper, when your child is still alert. With all of different activities, it would be a good replacement of watching television. There is no magic number of how many times during the week or day you should read with your child. Any addition to outside of school will be good for your child.