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9 x 12 = 108 sq in
8 x 8 = 64 sq in
108 + 64 = 172 sq in
Any pan that has an area of about 172 sq in would be fine - or a bit smaller for a thicker brownie.
A 12 by 12 square would give a thicker brownie, a 14 by 14 would give thinner.
I'm not sure what other size rectangles people commonly use.
No idea about adjusting the cooking time. Test it after about the same amount of time and see if it's ready.
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