I found an info thingy for Euros 2009 and it says on page 9 "The size of the main ice rink is 30 x 60 m. The size of the practice ice rink is 28 x 58 m." So unless the info is false or they changed that since then.....The rink size at Hartwall Arena should be 28 x 60 m which is comfortably inside the olympic standard for ice hockey as well as for figure skating. This was trickier to find out than what I thought as the official site apparently does not feature such a minor detail.