When we count each oncall, we take into consideration the percentage oncall that the person does based on their jobplan on that oncall. So, the counts presented here are relative counts. A LTFT80 person gets 100/80 for an oncall.
What's an Epoch?
In CD, we have Epochs. These are significant points in time when staffing changes. This means that we reset counts and just need to count in the current Epoch.