Boulder problems are generally shorter than 20 feet (6.1 m) from ground to top. This makes the sport significantly safer than free solo climbing, which is also performed without ropes, but with no upper limit on the height of the climb.
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If you've wondered how many V17 boulders there are, and who climbed them, you are in the right place. I'll break down, one by one, every V17 boulder problem currently out there. At the time of writing (June 2023) there are currently four boulder problems that have retained the V17 grade.
Subjectively V4 is the grade where the climbing starts to require good technique but not really any specialized strength. Outdoors it could take about 3–5 years to reach the point where you are comfortable climbing but outdoors is much harder, in the gym I would say about 2 years.