I am helping to correct some errors in a game manual not originally written in english. I've come across a bit that I'm not sure what to do with.
The game consists of several 90-minute matches.
My question is whether this is correct or if the line should read:
The game consists of several 90-minutes matches.
I feel like the original version is correct, though I only base this off of the fact that is "sounds" right to me. I've done a bit of searching and found a blog post about something similar here. It doesn't provide a definitive answer though.