Was wondering how to get accurate info on border crossing wait times between Slovenia and Croatia, and found this interesting website:
https://eliteinformatiker.de/2018/09/14/monitoring-border-wait-times
Under Findings there is a graph of wait times for an entire year at one of the crossing points.
and the web page it describes that aggregates some wait times is here:
https://traffic.molescrape.com/
Just an FYI in case you find this useful.