That all depends on the skater, obviously, and what distance they're skating. Quick research reports that they can average 30 mph, but sprint up to around 37 mph.
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It doesnt. If you know how to skate, just throw your skates on and go. However if you want to be competitive and go to provincial/national meets, you will probably be skating for about 4 years before you come close. It also depends on your age, and where you live.
It really depends on who you are and what you classify as being able to skate. If you want to be able to do jumps and tricks then it could take years, but if your goal is to be comfortable on the ice and be able to have fun instead of focusing on not falling on your butt then it may only take a few times on the ice! If you are very young (child or infant) then it could still takes a few years, but if you are in your teens or an adult it could take you a few weeks depending on how often you want to be on the ice.
it depends on how hard you work, i learned in about a month, but then again, there is no limit to knowing tricks