My book shelves are 3 feet long per section, and I have 12 sections filled up, plus three more boxes filled up and heavy enough that it requires two people to carry them safely. That is ALL of my RPG stuff, though. Not just 3E.
I've got you edged-out.
After 30 years in the hobby, my gaming posessions fill 16 3ft bookshelf sections + 2 3'6"ft tall Elfa carts + a 3'6"x2'x18" stack of Sterilite drawers (Dwarven Forge stuff) + a 5'x16"x12" stack of Sterilite drawers (various plastic minis) + a 3'x9"x9" stack of Sterlite drawers (Rocketmen CMG) + 1 each DDM Red, Blue, Black & White dragons + 2 4'x2'x2' trunks (M:tG Alpha-6thEd) + 18 cardboard double card boxes of various other CCGs + 34 Chessex Minis boxes + 2 3' portfolio tubes + 1 6' portfolio tube + 1 6'x5'x18" Intermetro commercia shelf system (5 levels) filled with my boxes of Dragon and Dungeon magazines and unopened boxes of minis.
And that is after I purged a lot of stuff at Half-Price Books...
So, if you have less than that, you're probably OK!

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