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Forerunner 945 average charging time?

Good evening friends!  First post here.

I have read a lot of posts regarding the 945 battery life, but I haven't found one discussing the charging time.  The instruction manual says it takes "two hours to fully charge the 945".  However, mine usually charges to 100% MUCH quicker!  Mine takes literally half! 1 hour to fully charge from 0%.  I am using a computer USB port (not a wall charger).

I believe I have checked everywhere and no one discusses the issue.

Is this what you guys are experiencing as well?  I was curious, as I had a night where almost 60% got drained, but then other night that went with only 10% (both measuring pulse ox).

I'm OK with charging the watch every 3 or 4 days, but I wanted to ensure that I am properly charging it.

Thanks! Best regards,

Rafa.