The ring doesn’t as much make you invisible as it transports you into the shadow realm. Sauron, however existed in both the real world and the shadow realm, so there was no transporting needing to happen there.

About 4 hours

Nope!

Some explanation though, Canada adopted the metric system and converted to metric in the 70’s-80’s. I remember seeing street signs in imperial and signs advertising the conversion (“50mph is 80kph” and stuff), so a large portion of our population spent a good chunk of their lives on imperial, or grew up with those people as parents. So, what happened is, the signs changed, and our speedometers changed, but people’s brains still went “this is miles per hour”, and well, it kinda stuck.

Now ask me how far it is from Toronto to Ottawa…

This seems like more of an implosion, we should ask Stockton Rush what that sounds like… oh.

Mixing metric and imperial is base-tier Canadian.

Sure, we will measure our height in feet/inches, except on our driver’s license, and weight in lbs, except at the doctors office. We’ll measure our car’s speed in km/h numerically, but if you hear a Canadian say “miles per hour”, it also means km/h, unless we’re talking about driving in the US, then it is actually mph…maybe.

Now, ask a Canadian how far away something is.

It wasn’t a big deal, but there was a lot of loud, stupid people making a lot of loud, stupid noises about it when it happened.