Yeah it is the same for me, I was just checking it everyone's would have been the same because I know some people may charge theirs differently and sometimes will be keeping theirs on charge during the day or overnight.
A better check might be how long it takes to drop 10%. In my case about an hour, or more. Which matches pretty well with the 10 or more hours I get to a charge.
I also use the rough gauge of 10% equals an hour.
Seems to work.
So one percent approx 6 mins and thats my mathematical skills exercised to their limit.....