A little late to punch in here, but it would be craven of me to avoid my mess entirely.
When I posted 'It is a 10-minute meeting = It is 10 minutes' meeting', I was still thinking of the previous post ('He is on a 3-month probation -- He is on 3 months' probation')
I don't know why probation works while meeting does not (something to do with the preposition?), but I certainly agree that 'It is a 10-minute meeting' is the only way to go.