The battery charging time for the product is not explicitly stated. However, it is mentioned that the battery can be charged quickly using the enclosed USB charger.
According to the instructions, yes. However, we decided to buy the blue brother, the Cross Thunder (also at Galaxus). We race with both of them at the same time. So question only half answered, sorry.
Only sensitivity with the remote control is possible from my point of view. This also allows the car to be driven very slowly and in a controlled manner.
In the packaging there is a short "User Manual" on the back of which there is an overview of all the individual parts of the vehicle, including the respective part number. It also contains the necessary information for ordering spare parts. The additional battery, for example, has the part number "43415". The corresponding charging cable, for example, has the part number "43416".