How to safely charge Fenix 6

I currently charge my Fenix 6S using the USB output on my computer at work. But it takes ages to fully charge. Does the watch support "fast charging" and if so what wall charger can I safely use? I don't want to shorten the lifespan of the battery hence why I have been slow charging until now. Will a Samsung 240v - 5v adapter be safe to use?

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