I have data for people scanning into and out of a building. I have visualized this using a Gantt chart by starting with the IN time and using the length of visit as the size. This is a great visualization and has been really helpful in identifying some interesting patterns. I'm curious though, is there a Table calculation that would, by minute, count the number of people in the building? I can think of some inefficient ways of doing this in R, but I'm curious if this is easy to do in Tableau. Thanks!