What is your personal “follow up with client” policy?

The firm I work for just asks that we contact clients to follow up with them every 2 weeks after making first contact. They don’t care how, so long as we just do it. I do 2 emails and a phone call but just got a client who was indignant at the fact that I took essentially a month a half to call. This is the first time it’s happened since I started a year ago. Thoughts appreciated!