That sounds excessive.... I would guess 3-4 hrs max
Tho in the Pro/Pro2 the battery in the camera really only charge to 80% ( it will read 100% charged ) as a safety factor if left plugged in all the time to not damage battery. This may be a full charged battery but just a flaw in the reading.
(To get a quick estimate of any charge, look at the output current of the charger and divide into the capacity of the battery)
( output 500ma /capacity battery 2000ma... 4 hrs aprox )
Morse is faster than texting!
The indoor chargers seem to take an inordinate amount of time to charge. Note that the charger is 5v only. I also have the outdoor 25 foot chager which is 9v and it charges much more quickly. I don't have hard numbers for either so can't tell you what to expect other than many hours for the indoor charger.
I also haven't tried a charger that supplies both 5v and 9v outputs such as those supplied with the Pro series of cameras. I doubt it would make a difference but it might be worth a try.
I purchased 2 of the 4 camera kits and only one of the charging cables/adapter worked. Have to take it back. @jguerdat can I ask where you purchased the outdoor charger. Have some on back order with Amazon