These are your marketing tools, so spend some time on them. Also, feel free to make an appointment with Wendy Seligmann, Director of Career Services. There is no reason to rest and relax even after the last stamp is licked. During this nail-biting period, remember that the mail does take time.
Organizations also have other responsibilities beyond processing student inquiries.
Two to three weeks is the average waiting period. Do not neglect to follow up. If you feel comfortable, make a phone call to the person you wrote. Then you can take the opportunity to talk about your interests and how they fit with the organization in more detail. Pace your conversation based on the kind of response you are getting from the person at the other end.