You might find this info helpful.
What Is a Good Download Speed and Upload Speed? (lifewire.com)
The best I can find from Canvas is this information:
"You can use the Rich Content Editor to record video and audio media. You can record media for any length of time, but shorter media recordings are recommended. If your media is longer than 15 minutes, you may want to consider recording and uploading using an external provider. Longer media recordings require more time to render and may be interrupted without a stable internet connection."
How do I record media using the Rich Content Edito... - Instructure Community (canvaslms.com)
When students say they "Cannot get it to work", do they necessary mean it's an upload issue? Could they have issues with their browser accessing their webcam and mic? I would suspect it's more of a technical issue with their system and software than a bandwidth issue. If the professor is asking for very long videos, it might be best to break up the questions into shorter videos.
Does this happen throughout the semester or just the first couple of exams? I would strongly encourage the professor to require a practice exam that asks the students to test their systems before an actual exam. I would also give very specific tech requirements to the students such as what browsers to use, whether a smartphone or tablet is acceptable, and perhaps not using a hotspot from their phone. And anything else you think might cause an issue.
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