You'd be surprised how little you need to use this public fast charger.
The vast majority of EV charging happens at in a garage while you sleep or work. If you aren't going anywhere for 8 to 10 hours, the vehicle's on-board charger will happily deliver energy to the battery, slow and steady.
Contrary to some media reportage, EVs don't need a high power connection in the garage; a simple 10 amp socket can work just fine. This will limit your charging power to about 2 kW, which means a full charge from empty will take at least 12 hours for a small EV and up to 2 days for a large one! It is generally recommended that you install a dedicated charge point though, preferably hard-wired into the home's electrical supply. This limits wear and tear on the GPO and also makes it easier for you each day (open charge port, plug in).
Otherwise a 7 kW (32 amp) dedicated charge point will fully charge most EVs in about 8 hours. Of course, you may not need a full charge and it's generally better for battery longevity if you don't leave the car at high states of charge for long periods of time, especially in warm climates.
When travelling longer distances, you may find yourself needing a charge from a rapid charger, or DC fast charger. These are a direct link between the fast charger and your vehicles battery, and can push anywhere from 50 to 350 kW into it! Of course the battery needs to be capable of this, so the actual rate will depend on the vehicle, it's temperature, how full the battery is and what the DC fast charger is capable of delivering.
Another useful measure to know is the charge rate in km/h - how many kilometres of range are added to the vehcile per hour of charging. This will depend on the power of the charger, the energy efficiency of your EV and the maximum acceptable charge rate of the battery. A Hyundai Ioniq may sip electrons at a miserly 120 Wh/km, but the charge rate is limited to less than 40 kW for the most part. Moreover, the charge rate will taper down as the battery fills up, so an hour of charging will still only add 200 km of range per hour.
You will probably need to pay to use the chargers, either through a network memberhsip or an RFID card to activate the charger. Network operators like Chargefox, Chargestar and Evie have details on their websites about how to use chargers on their networks, and in most cases allow you to download a mobile App which allows charging.
An unwritten rule of DC fast charging etiquette is to not stick around longer than you need to. If you have 50 km to travel and already have about 100 km of range left in the battery; you are better off driving to your destination and plugging in there. It will invariably be cheaper, but it also frees up the charger for someone who might need it more.