The charging time is similar to the charging time of the camera charging function itself. The exact time I did not take.
The additional loading of a smartphone or iPod via USB is just very practical abroad, since it saves outlet spaces.
The LED indicates whether the battery is still charging (red) or is ready (green). If no battery is inserted it will light an evergreen, even if something is connected via USB.
Good news: Proposal has no beeping or (coil) whimpering when the device is plugged in and charging or not charging.
For the price a great purchase. Strong buy recommendation!