Perhaps buy an old school timer outlet and before charing, set it to turn off after x mins. I think you can estimate how much time it does take to charge from

Perhaps buy an old school timer outlet and before charing, set it to turn off after x mins. I think you can estimate how much time it does take to charge from x to 80. Or for folks who have home assistant and some controllable socket - automation should be possible as mobile phone reports battery charge!