The compensation is usually related to the issue.

Renewing Elite Status and extending a PC membership is not really related to a broken seat. It would be nice, but it just doesn't work that way.

But a travel voucher or an upgrade cert or a bunch of miles could be.

12 hours is a lot of time, so you'll probably get something. If there's something specific you're looking for, ask for it, but be sure it's somewhat related to the issue at hand.