if your coming off days off and don't acknowledge (phone) until 2359L then the earliest they can schedule you is 1200SC... so if your on your last day don't answer the phone or call them back until midnight.

RSV Gouge 5.5 Excerpt: 10 hours notice for SC assignment 0000-1759 - 12hr notice from 1800-2359 (20-K-6-d)