KQL Query to summerize session counts over time

Hello folks,

I'm trying to find a "good" way to achieve what I think is a simple task but cannot think of a simple solution.

I have logs with session information, one entry per session

StartTime(datetime), EndTime(datetime), Duration(in seconds), Computer(string)

I want to count how many sessions are active for each 5 minute interval and graph that. Keep in mind, the sessions will overlap.  I included a graphic of what I'm trying to do. With the result below

Which should return:

Time + 5, 1

Time + 10, 3

Time + 15, 3

Time + 20, 2