My oldest visited 4 schools junior year and said he didn’t need to visit any more, he’d just apply to places with good CS programs and decide after he got in. He didn’t get in anywhere he visited and also applied so he visited 4 more colleges after the acceptances were in. (Though really he could have just visited the top two.)
Younger son liked visiting, but he didn’t go to see that many. 2 in Feb junior year, 2 more in April, a couple with friends over the summer, and 3 over Labor Day weekend. He didn’t miss any school. He applied to 4 of the school he had visited and another 3 he hadn’t. He visited again (and in the case of one school for the first time) after he got his acceptances