What dimensions should I make a blanket for 2 people to cuddle up on a couch together?

I want to knit a blanket for my boyfriend that is a comfortable size for us both to be covered comfortably when we lay together on the couch. What should I make the length and width? I was initially thinking 5 feet wide by 6 feet long, but according to my calculations that will take 17 skiens of super bulky... show more I want to knit a blanket for my boyfriend that is a comfortable size for us both to be covered comfortably when we lay together on the couch. What should I make the length and width?

I was initially thinking 5 feet wide by 6 feet long, but according to my calculations that will take 17 skiens of super bulky yarn!!!

What do you think? How big should I make it?

Note: we are both average size people and he's 5'10.
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