The "0 to 80% in 45 minutes" figure that shows up on most fast charger spec sheets is real, but it depends on several factors worth understanding before taking it as an absolute promise.
With a 40 kW charger, a vehicle with a mid-sized battery (around 50-60 kWh) can reach 80% in roughly an hour. With 60 kW that time drops noticeably, and with 120 kW many compatible vehicles come in under 40-45 minutes, provided the car itself can accept that power.
Here's the key nuance: the charger delivers the maximum power it supports, but it's the vehicle, through its BMS, that decides how much to accept at any given moment. A car whose maximum DC charging power is 50 kW won't charge any faster on a 120 kW charger than it would on a 60 kW one.
What's more, charging speed isn't linear: in the first few minutes, with the battery low, the accepted power is high; as it approaches 80-90%, the BMS itself reduces power to protect the battery. That's why almost every manufacturer talks about charging "up to 80%" rather than 100%: the final stretch is always slower, regardless of the charger's power rating.