The #1 complaint we get about the crowd calendar is that the numbers aren’t accurate. This is true even if we’re spot on. I (len) think this is becase we don’t go a good job of explaining that a crowd level of ‘2’ can still mean an 80-minute posted wait for Seven Dwarfs Mine Train. – Len Testa (@len ) Feb 2023
For some insight into the Crowd Calendar and what it represents take a look at this topic:
Make sure to follow the cited TP Blog post as well as the illustrations created by @Jeff_AZ. The crowd calendar is derived from an extensive collection of wait time data using a statistical analysis technique called Cluster Analysis.
If you really want to hurt your head (apologies to Fred and Becky) take a look at this for more background: Cluster analysis - Wikipedia
TL/DR - the result is not going to be linear.