Nice. Neo's charger works at 42V and 2A. 6 hours sounds reasonable if it was drained fully.
I never drain the battery to its last bar and therefore I only need ~3 hours.
Many people seem to want fast charging. It could be done but there is a reason behind why 2A charger is more popular.
If you charge at 4A - 6A, the battery assembly could heat up slightly. One needs to arrange the configuration (series or parallel) very carefully to minimize heating and maximize charging efficiency.
Extra info: Tesla's supercharger charges at ~380V-400V and at ~250A and the USP of Tesla is their battery pack and how it is configured/ cooled to maximize range. They suggest not to use supercharger too frequently. 220V is the preferred method. This is to avoid build up of heat inside the packs.