This schedule is set up for teams that rotate 12-hour shifts that are on for one week, and then off for a few.
This schedule has 6 users that alternate their shifts every other week. One week, they work Sunday-Tuesday-Thursday-Saturday (STTS) and another week, they work Monday-Wednesday-Friday (MWF). In total, there are two six-week rotations as everyone rotates through the MWF schedule, and one staggered by three weeks, where they work through the STTS.
Layer 1 rotates weekly with a handoff time at the beginning of the first time restriction. It will cover the STTS days by restricting on-call duty to specific times-of-the-week.
Layer 2 rotates weekly with a handoff time at the beginning of its first time restriction. It will cover the MWF days by restricting on-call duty to specific times-of-the-week.
Note that the order of the users changes to prevent double shifts. To prevent overlap, the bottom three users become the first 3 on layer 2. This prevents overlapping or double-shifts.