90 hours? Man, you just bought tears of joy to my eyes. Now, that's getting your money's worth!
It must have taken me over 2 hours to get the boss key in the water temple, swimming here, there, and everywhere. It was all done in the same dang area, east of the dual cog room. The first time I was in there the clam got me. Then I remembered that I could switch over to the Zora suit. D'oh!
I'm saving the Eel boss for tonight.