How long do storage heaters take to charge?

glocal

In that case shifting the 4 hours of charging towards the end of the 7 hour window reduces the thermostat switching on and off to top up in the middle of the night. And reducing charging to less than 4 hours may or may not store acceptable heat for the following day. I must say if the heater gets that hot at 14kWh, I can't imagine what it will be like at 24kWh. Thanks everyone for your time.