This is probably one of the most common questions among content producers who are just trying to find that sweet spot among their audiences.
Along with all the best tips on optimal lengths for tweets, blogposts, and headlines, Buffer added a few additional lengths to the list including SlideShare length, Pinterest length, and more.
This guide should be very helpful in helping you to decide on what is too long or what might not be long enough the next time you're producing online content!
Happy creating!
