There’s 2 parts to answer this.
Firstly, you’d need absolutely no public access between your home and the car, anything other than that and you need to accept you’re creating a trip hazard and the risks involved. Even putting a protector over a cable can cause issues as any wheel chair user or push chair ‘pusher’ have discovered.
If you have a safe 3 pin plug that’ll be happy running near full tilt for 3 hours solid, you’ll not get a huge amount. These are typically 3 kWh chargers, so for the 3 hours you’ll add 9kWh, for my 77kWh Ioniq5 that’s not a huge percentage of battery. In terms of mileage, assuming 2.5 miles per kWh in winter (which is a little harsh) you’ll get 7.5 winter miles but in summer at 4 miles per kWh you’d be adding 12 miles. That’s enough to ensure your daily mileage isn’t lost too quickly.
In addition, if you shop at Tesco, they’ll have 7kWh chargers that aren’t stupidly expensive and can give you enough of a boost in a couple of hours to make up for a week’s losses if you’re charging every other day. Alternatively the Lidl rapids aren’t horrendously prices neither are the Tesla ones, if you’ve one near by you can give yourself half an hour and will put the battery up to fullish (depending upon car) after a week’s driving without charging from home.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark