60
seconds
Six ten-second sprints with five seconds of rest between them. Go flat out, breathe, and go again. It is how runners get faster, and fingers are no different.
Start typing and the first sprint begins. Ten seconds later the words dim and a five-second rest begins: keys do nothing, so you can shake out your hands. Then the next sprint starts. Six bars above the words fill in with each sprint's speed as you go.
In a one minute test, part of your brain is always rationing effort. In a ten-second sprint there is nothing to save it for, so you type at a speed you rarely reach. Doing that six times, with a breather between, teaches your fingers what that speed feels like. Over time, it becomes the pace you can hold for longer.
Afterwards, try a 1 minute test or race your ghost while your fingers are warm.
The clock starts on your first key. You type as fast as you can for ten seconds, then the words dim for a five-second rest during which keys do nothing. That repeats six times, about ninety seconds in all.
Each sprint gets its own speed, counted from the letters you typed correctly during it. Your score is the average of the six, and the results show every sprint so you can see where you peaked and where you faded.
Short rests let you type each sprint at a speed you could not hold for a full minute. Practising at that speed is what raises your ceiling. Without the rests you would simply pace yourself.
A set or two at the start of a session is plenty. Follow it with a normal test and notice how the usual pace feels easier.