Charging time 6 Pro

I can't speak specifically for the 6 Pro. I have a 6X arriving tomorrow. But in general when it comes to charging watches, phones, even cars the following will tend to be true....

Assuming the charger can supply enough current the device will only charge at the rate it wants to. You cannot force it to charge faster than its designed rate. To do so would likely shorten the life of the product and might even be dangerous.

Batteries tend to accept charge at a faster rate between 20-80% full. Above 80% the charge rate usually reduces, possibly even more the closer it gets to 100% full.

In my opinion you can maximise battery lifespan (years rather than days/hours) by charging only to around 80%. This causes less stress to the battery chemistry and, while you may need to charge a bit more often, the service life should be increased.

The charging regime I apply to my current 5X+ is to charge to only about 80% and then stop. This will keep me going for a full week before the next charge with ample in reserve. Basically I charge every Friday afternoon/evening. I look at the state of charge and make a guesstimate for how long it needs to get to 80% and I set a timer to remind me to check progress. Typically it's 30-60 minutes.

I think I have an issue with my garmin fenix 6 pro (42mm), it's brand new and it takes one hour to gain 1% of battery charge. I've tryed with different chargers having different Ampere, but nothing changes. Besides, it's getting warm during the process. I believe it's faulty but I' not sure if there's anything I can do about it but returning it to Garmin

If warm and not charging it sounds like you either have a faulty watch/battery or there is an out of control process running in a loop on the watch.

Try a hard reboot by holding the top left (light) button for around 30 seconds, beyond the assistance screen, until it shuts off. Wait a few seconds and then restart the watch. You may lose a little data from today, with recovery time reset to zero (if not already at zero) and maybe a jump in body battery value, but not much important otherwise. Maybe this will fix it. If not you probably need to contact Garmin.

I've now had my watch for 13 months. No battery problems for me and it charges at pretty much 1% per minute from laptop or charger, at least from 20-80%. I try not to charge higher than that.

genius! I followed your advice, had a hard reboot, and it's now recharging at 1% each three minutes, which is totally fine. It kept my data - recovery hours for example - but it changed the watch face. I wait for it to be "fully" (80%) charged and then I'll try to re apply the previous settings. Hopefully it was a hanging process, and not one of the widgets/watches I downloaded. thank you!