Well then, time to set some speed run benchmarks for future players of my courses.
Here's my profile. I've only posted five courses so far, four of them from before the checkpoint patch (which I'll likely add checkpoints to and revise when I find the time), but I might as well share them here now that there's an easy way to do it.
My latest (still quite new and in need of playtesting):

Throwing Up All Over
I hope you remember your SMW techniques. Look for the optional challenge objective (clear the course with Yoshi) and brag on Miiverse if you manage to achieve it. One of you here already has.
And my older ones, in order of completion rate from easiest to hardest:

Bait-and-Switch Beltway
If you don't already know how P-switches interact with conveyor belts, you are about to find out.

Take the A-Train
Prepare to be boarded.

It Might as Well Be Spring
My first course, created under Day 2 constraints in the toolkit.

Ghost of a Chance
My most complex creation, with many alternate paths and unique encounters, but also a frightfully low completion rate due to its length and the difficulty of one of the bosses. I plan to retune this one but invite you all to clear the original as a challenge.
I keep abreast of the Mario Maker OT, but it's nice to see everyone's portfolios once again in a much less cluttered thread. Hoping to catch up with some of your courses soon.