On the ESRI training course website, there are a variety of filters that allow you to identify courses of interest. You can then sort them in 1 of 5 ways as shown below.
I would find it very useful if there was a sixth option and that is to simply sort the currently filtered courses by the estimated time required to complete the course.
Why would I want this? Sometimes I try to squeeze a short course in between work and at that point I am looking for short courses to do rather than start a 3 hour course.