Throwing hammers does consume the super faster. The only reason it lasts so long is because everyone and their mother specs for forgemaster, which like all roaming supers, increases the duration of hammer of Sol. Longer super time, more hammers. I think that speccing for forgemaster is a bitch move. I go for Suncharge. Way more devastating, but the super lasts half as long, so it balances out. Besides, seeing a hammer is one thing, but getting -blam!-ed in the face by suncharge because someone wanted to try to close range me is so god damn satisfying. It's like a shoulder charge with Triple the range and you slap the person with the hammer. Truly boner inducing.