advanced roadmaps team capacity vs issue estimates

[Doug Leno]

Hi.  I'm new to advanced roadmaps and tryin to understand system behavior re:  team capacity and issue estimates.  Where can I find documentation on how an advanced roadmap plan calculates available team capacity?   I set up a simple (Kanban) experiment with a team capacity of 80 hours per week in the plan, which I assume is the equivalent of 10 working days. I set up an issue with an estimate of 20 days and assigned it to the team just to observe the system behavior.  The parent epic's start and end dates roll up as expected in the plan but I don't understand the behavior of team capacity:  Instead of linearly applying team capacity  of 10 days in week 1 and 10 days in week 2, the system allocated the team at 3.33/10 days in week 1 and 16.67/10 days in week 2.  There are no other issues assigned to this team during those two weeks.    I'm out to understand how the system behaves in these situations.  thanks!