I do interviews any time the potential clients want to come. I usually prefer people come during daycare hours so they can get a feel for my interactions with the children, their kids can participate, so on. I've never had a problem with it. Sometimes, if I'm really lucky, the visiting children will cry when their parents tell them it's time to go home....that usually secures the client
In 11 years, I've never once had a problem interviewing during daycare hours.