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I used to get the coordinates in about 30 seconds, but now I have to wait 4 hours. What has changed here?

It's set up so that you should provide resolved coords in the same ratio as you're acquiring them – ideally, you need to provide more final coords than you take. That way, you won't have to wait. If you're just taking coords, the longer you'll end up waiting. It's a trade-off system.