How long does it take to charge the HP ProBook 450 G5 battery?

The HP ProBook 450 G5 can fast charge to 90% within 90 minutes when the system is off or in standby mode. This requires the power adapter provided with the notebook and no external devices connected. After reaching 90% capacity, charging speed returns to normal, and charging time may vary by +/-10% due to system tolerance. (Page 1)