Is there a problem with my micro SD encryption?

I have an LG G5 running Android 7.0 with the latest updates on T-Mobile. My micro SD is a 128 GB Sandisk class 10 with about 100 GB full. I've had the card for a few years but haven't noticed any slowdown issues. I decided to encrypt the card using Android's built-in features. It's been going on about an hour now at 1% complete. It did start at 0% and moved up to 1% after about 20 minutes, but I'm concerned now that it may be stuck, as I've read about that happening. Most of the files on the SD card are photos/videos/music, with the rest being app data and whatnot.

Is there anyway to tell if the encrypting process is stuck? If it's stuck, what should I do? How long should I expect it to take? A day? Longer?

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