Does iMessage really take 2 days to activate?

I just upgraded the os on my iPhone 5 and iMessage is taking so long to activate. It's been almost 2 days. I tried rebooting, resetting network settings but it still won't work.before the upgrade it worked just fine.

It shouldn't take 2 days to activate. More like 5 minutes. Call apple see what they think.

No, its right away.

It just depends it can take 1 minute to days. Just need to be patient.