How long mopub ad unit takes to warm up?

Question

I'm using successfully MoPub displaying ads correclty. I created a new Ad Unit in the MoPub publisher console, I changed the current id with the new id but no ads are displayed anymore. In the logcat I see the following message:

Ad Unit (xxxxxxxxxxxxxxx) is still warming up. Please try again in a few minutes.

I waited for 8 hours but still get no ads. What's I'm doing wrong?

Answer 1

Today I started receiving ads. It seems that up to 2 days are needed to warm up ad-units. Also posted a request on the mopub forum without having got any response (https://groups.google.com/a/mopub.com/forum/#!category-topic/mopub-users/technical-integration/71iV6IFEFJ0)

Answer 2

ad unit still warming up is something you'd see in an ad unit that doesn't receive a lot of traffic. If you try again in a few minutes/make a few more requests, the ad unit should respond with an ad.