With my fairly average graphics card — Radeon RX-590 (https://www.videocardbenchmark.net/gpu.php?gpu=Radeon+RX+590&id=4025), for a given keyspace. More recent cards will be quicker. Next year, more recent cards will be quicker still! 7 characters, uppercase, lowercase, and numeric — around 8 minutes: 7 truly random characters, under 3 hours: