watch charging extremely slowly

Please compare your screen with the pictures in If your Apple Watch won't charge or it won't turn on - Apple Support and also see the other notes about charging problems.

You have done the standard DIY checks and confirmed there is a problem, the next stage is help direct from Apple Support. Your profile suggests Series 4 so your watch is still in warranty. Contact Support (link) and get an official support case started. They might be able to do remote diagnostics over the network, or simply arrange a Genius Bar appointment (or mail-in service if it is more convenient for you) to get your watch and charging accessories checked.

Adding: Hint, try to get a Genius Bar appointment if you have a store within reach, because that means you can demonstrate the problem face to face and also get the watch and charger checked as a combined set.

Did you remove the plastic covering the charging pad?

Slinnshady wrote:

does anyone have any actual beneficial advice?

Sorry, we have to ask the obvious questions before we get the embarrassment of sending you to the Genius Bar for a simple fix. I will never forget one user who complained about the quality of the camera on his new phone... I asked Did he remove the protection film? He sent me a picture of his fingers holding a little slip of plastic he had just removed, and one word... FIXED